最新刊期
卷 54 ， 期 3 ， 2024
- 摘要：Basin runoff is an important response factor to changing environment. Under the influence of climate change and human activities, watershed runoff has undergone profound changes. Studying its evolution and response characteristics is helpful to improve human’s ability to cope with changing environment. Taking the main catchment area of the Beijing municipal area of the North Canal as the study area, the variation trend of rainfall and runoff in the North Canal basin was analyzed by analyzing the hydrological data of hydrometeorological observation stations in the past 40 years, and the flood field was extracted. The global climate model data is introduced, the downscaling model is used for downscaling, and the runoff forecast is analyzed in combination with the hydrological model. The results show that the historical precipitation trend of the basin is not obvious, and the runoff is increasing. In the future, the change of water resources in the North Canal Basin (Tongxian Station) will be more obvious under the influence of climate change. With the increase of temperature and precipitation, the runoff will increase, and the discharge is predicted to reach a new high of 385.1m3/s in the middle of this century.With the continuous increase of radiative forcing, the degree of hydrological response increases correspondingly, and most of the peak runoff in the North Canal basin occurs in the late 2050 and 2090 periods. The research can provide some reference for the future water resource utilization, flood containment and disaster reduction measures and the realization path of dual carbon targets in urban watershed.关键词：climate change;watershed runoff;runoff forecast;carbon peaking and carbon neutrality goals
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发布时间：2024-06-17 - 摘要：A rainwater outlet in the north moat of Dongcheng District of Beijing was selected for joint monitoring of water quality and quantity, and the characteristics of rainfall runoff pollution in the old city under light rain, moderate rain and heavy rain were identified respectively. The initial scour effect and sensitivity indexes affecting runoff pollution and their thresholds were analyzed, and the control scheme of source and end pollutants in the old city was formulated. The results showed that the pollutant concentration was higher in the early period of rainfall (20 min before light rain, 30 min before moderate rain, 10 min before heavy rain), and there was an early scour effect. The sensitivity of light rain to SS, TP and TN is higher than that of moderate rain and heavy rain, the sensitivity of moderate rain to COD and NH3-N is higher than that of light rain and heavy rain, and the EMC concentration value of moderate rain and light rain is higher than that of heavy rain. For SS, NH3-N and TP indexes, heavy rain, moderate rain and light rain had the largest variation range of pollutant concentration. When the runoff pollution reduction rate is 30%, the runoff volume of light rain, moderate rain and heavy rain should be controlled to be 25 m3, 35 m3 and 150 m3, or the rainfall in the early rainfall should be controlled to be 4 mm, 9 mm and 24 mm respectively.关键词：Beijing;the old city;rainfall runoff;pollution characteristics;first flush
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发布时间：2024-06-17 - 摘要：Accurate simulation of floodpeak and its hydrograph is crucial for flood control and disaster reduction analysis. The selection of rainfall loss and runoff generation model is often critical for flood process simulation. To evaluate the applicability of different rainfall loss and runoff generation models in the Sunshui River Basin in Southwest China, this study constructed three rainfall-runoff modeling schemes (scheme 1: SCS Curve Number method+ Snyder Unit Hydrograph method, scheme 2: Initial Constant Rate method+ Clark Unit Hydrograph method, scheme 3: Green-Ampt method+ SCS Unit Hydrograph method).The HEC-HMS model was used to simulate 15 flood events from 2007 to 2018. The results showed that Schemes 1 and 2 demonstrated satisfactory performance in simulating the flood hydrographs in the study area, with Scheme 1 performing better for single-peak flood events and Scheme 2 performing better for double-peak flood events. In comparison, Scheme 3 exhibited inadequate simulation performance. The findings of this study can provide reference for flood simulation and prediction in similar areas.关键词：HEC-HMS;Sunshui River Basin;rainfall loss model;runoff generation model
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发布时间：2024-06-17 - 摘要：Green roofs are of great significance in mitigating the adverse effects of urbanization. The Tianjin area is highly urbanized, but the development of green roofs is relatively lagging behind, and there is a lack of feasibility assessment and planning schemes for the large-scale construction of green roofs. This study takes Nankai District of Tianjin as an example, and selects building attributes and greening demand degree as evaluation criteria to establish a system for assessing the potential of green roofs suitable for construction. Based on GIS and TOPSIS, the spatial distribution of green roofs in Nankai District of Tianjin is presented. The results of the study show that the suitable area of green roofs in Nankai District is about 5.17 km2, and the average score of suitable potential is 0.53, and the suitable potential shows a trend of " high in the north and low in the south". There are 46 highly suitable communities in Nankai District, and prioritizing the construction of green roofs in suitable communities can more effectively play its role in improving the urban environment.关键词：green roof;roof type;green coverage;building density;TOPSIS
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发布时间：2024-06-17 - 摘要：The comprehensive evaluation of agricultural soil fertility is an important link for ecological protection and sustainable agricultural development in the Weihe River Basin of the Shaanxi section of the Yellow River tributary. In this study, the Weihe River Basin of Shaanxi Province is taken as an example, as the research area. Agricultural soil samples are collected from 13 representative locations along the Weihe River Basin in Shaanxi Province. Eight physical and chemical fertility indicators are measured, including soil pH, electrical conductivity, organic matter, total potassium, available potassium, total phosphorus, available phosphorus, and total nitrogen, as well as three biological fertility indicators, namely urease, sucrase and catalase.Using principal component analysis (PCA) and Nemerow index method (Nemerow), a composite index of soil fertility in the area is calculated and the two are validated against each other to arrive at a qualitative status of soil fertility in the area.The analysis and testing results indicate that: ① The soil pH in this area is generally high, with a mean value of 7.99 and weak alkalinity. The mean content of organic matter is 17.295 g/kg, while the mean contents of total potassium, total phosphorus, and total nitrogen are 6.17 g/kg, 1.06 g/kg, and 1.27 g/kg, respectively. The mean contents of available potassium and available phosphorus are 133.46 mg/kg and 16.02 mg/kg, respectively. ② The results of comprehensive fertility assessment of Weihe River soil in Shaanxi Province indicate that the average fertility score by PCA is-0.001 5, while the average comprehensive fertility score using Nemerow index method is 1.342. Based on the criteria for soil fertility evaluation using principal component analysis and Nemerow index method, it shows that the agricultural soil in the Weihe River Basin in Shaanxi has a moderate level of comprehensive fertility, with moderate nutrient content in the soil that can meet the growth requirements of general crops, making it suitable as a planting base for ordinary farmland. ③ The main factors affecting fertility are arid climate and geographical location, followed by human factors. This study promotes the utilization of agricultural soil resources in the Weihe River Basin and has important research significance for ensuring food security, economic development, and ecological construction in Shaanxi Province.关键词：Weihe River basin;agricultural soil survey;principal component analysis method;Nemerow index method;comprehensive evaluation of fertility
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发布时间：2024-06-17 - 摘要：Soil erosion mainly occurs in the Loess Plateau region of China, and the implementation of large-scale vegetation restoration measures further affects the soil erosion situation on the Loess Plateau. Analyzing the impact of vegetation changes on soil erosion can provide theoretical guidance for the ecological environment management of the Loess Plateau watershed. Based on the Chinese soil loss equation (CSLE) and multivariate data, this study conducts a comprehensive analysis of vegetation coverage, soil erosion, and their interactions on the Loess Plateau from 2000 to 2018. The results show that: ① The vegetation coverage of the Loess Plateau gradually decreases from southeast to northwest, and the vegetation coverage shows a stable upward trend over 19 years, with significant improvement in large-scale vegetation; ② The average soil erosion modulus on the Loess Plateau from 2000 to 2018 was 2 526.27 t·(km2·a)-1, which was positively correlated with rainfall. The degree of erosion was strong in hills, plateaus, and undulating mountains; ③ The area with vegetation coverage ranging from 45% to 75% in the Loess Plateau has a strong degree of erosion. When the vegetation coverage increases by more than 40%, it directly causes the intensification of erosion. However, when the vegetation coverage decreases or increases by no more than 30%, the change in rainfall is the dominant factor for the intensification or weakening of erosion. This study can provide reference for the comprehensive prevention and control of soil erosion and the improvement of ecological environment quality in the Loess Plateau watershed.关键词：CSLE;soil erosion;vegetation coverage;Loess Plateau
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发布时间：2024-06-17 - 摘要：River health assessment provides a foundation for the sustainable development of rivers. As a first-class tributary of the Yellow River, the ecological health of Weihe River is of great significance for the high-quality development of the Yellow River. In order to comprehensively evaluate the health status of Weihe River Basin, the ecological health evaluation criteria of Weihe River Basin were established by selecting 3 criteria and 11 indicators, including physical habitat status, water quality status and aquatic organisms status. The weights were determined by AHP, and the Weihe River Basin was evaluated by multi-level fuzzy evaluation combined with the principle of maximum membership. The results show that 8 of the 25 points are in a healthy level; 13 were at sub-healthy level; 4 of them are in unhealthy level, and the comprehensive health evaluation result of Weihe River is sub-healthy. The ecological health status of the Weihe River headwaters, Baoji section to Xi’an section is good, while the ecological health of Tianshui—Baoji section and downstream section is poor, and the unhealthy points are mainly concentrated in the downstream, showing significant spatial differences. The evaluation results of physical habitat, water quality and aquatic organisms are sub-healthy, healthy and sub-healthy, respectively. Physical habitat and aquatic organisms are the key factors affecting the health of river ecosystem, which are mainly affected by human activities and natural environment. It needs to take relevant measures to restore the ecological health of Weihe River.关键词：physical habitat;water quality;aquatic organisms;health evaluation;Weihe River
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发布时间：2024-06-17 - 摘要：Under the background of " double carbon" policy, it is of great significance to understand the synergistic effect of industrial carbon dioxide and air pollutant emission to realize pollution reduction and carbon reduction. This study takes the carbon dioxide and air pollutant emissions in Yulin City from 2015 to 2021 as an example. Firstly, the correlation degree of the influencing factors of industrial carbon emissions in Yulin City is calculated by using gray correlation analysis. Secondly, the Kaya constant equation and LMDI model are expanded to analyze the driving effects affecting carbon dioxide and major air pollutant emissions. Finally, a synergistic analysis of the thermal power generation industry and the magnesium smelting industry, which are the key industries in Yulin City, was conducted, and recommendations were made for the reduction of pollution and carbon emissions. The results show that the synergistic emission reduction effect is the first major driving effect driving the reduction of air pollutant emissions. Carbon dioxide emissions have the strongest correlation with nitrogen oxide emissions, and the LMDI model analysis shows that nitrogen oxide and carbon dioxide have significant synergistic effect. The results of this study can provide a scientific basis for the synergistic effect and high-quality prevention of pollution and carbon reduction in Yulin City and provide theoretical support for the government to formulate more practical and feasible strategies for pollution and carbon reduction.关键词：pollution and carbon reduction;gray correlation analysis;LMDI;carbon emissions;synergistic development
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发布时间：2024-06-17 - 摘要：Ecological protection and high-quality development in the Yellow River Basin has become a major national strategy. Coupling resources, population and industries systems to coordinate high-quality development is an important way to achieve this strategic goal. The paper analyzes the connotation of high-quality development of " resource-population-industry", and builds an evaluation index system on this basis. The entropy weight method, coupling coordination model, spatial autocorrelation model, decision laboratory method and interpretive structural model method were used to explore the comprehensive level, quality development of resources, population and industry in 55 prefecture-level cities along the Yellow River Basin from 2015 to 2021. Coupling coordinates the spatiotemporal evolution process and its fundamental influencing factors. Research shows: ① The comprehensive development level of resources, population and industries systems in the Yellow River Basin has shown a steady upward trend; ② The degree of coupling and coordination among the three is generally low, but the overall development trend is benign, at the same time, the spatial characteristics of " high in the east and low in the west" are present; ③ The coupling coordination degree of " resource-population-industry" system in the Yellow River Basin shows a strong positive spatial correlation, " high-high" agglomeration areas are mainly concentrated in the downstream areas of the basin, and " low-low" agglomeration areas are mainly located in the upstream areas of the river basin; ④ Among the evaluation indicators, the proportion of education expenditures in fiscal expenditures, the intensity of environmental regulation, the proportion of secondary and tertiary industries in GDP and the proportion of science and technology expenditures in fiscal expenditures are fundamental indicators that affect the high-quality development of " resource-population-industry" in the Yellow River Basin factor. Based on the coupling relationship of the high-quality development of the " resource-population-industry" system and the identified key influencing factors, corresponding strategic suggestions are put forward, in order to provide scientific theoretical support and decision-making basis for the high-quality development of the Yellow River Basin.关键词：high-quality development;resource-population-industry;coupling coordination;Yellow River Basin
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发布时间：2024-06-17 - 摘要：Identifying the correlation pattern and regional types between urban population and urban land use in the Yellow River Basin is of great guiding significance for the coordinated development of the human land system. Based on population census and urban land grid data, using methods such as urban population change index, urban land expansion intensity index, and standard deviation ellipse, this study reveals the spatiotemporal differentiation dynamic characteristics of urban population and urban land in the Yellow River Basin from 2000 to 2020, and constructs a coefficient for coordinated development of urban population and urban land, dividing urbanization regional types. The results show that: ① From 2000 to 2020, the urban population growth and urban land expansion in the Yellow River Basin showed a phased change, with urban population mainly increasing at a medium to high speed, and then transitioning to a medium to low speed. The urban land area in the Yellow River Basin shows a continuous increasing trend, and the urban expansion intensity of the same city at different stages has a decreasing characteristics from strong to weak. ② The difference between the long and short axes of the standard deviation ellipse of urban population and urban land in the Yellow River Basin from 2000 to 2020 continues to increase, indicating a strong consistency between urban population growth and urban land expansion in terms of spatial and temporal patterns. ③ The urbanization regional types in the Yellow River Basin can be divided into five categories. From 2000 to 2010, the urbanization regional types showed a trend of distribution from west to east, and from 2010 to 2020, they showed a pattern of distribution from southeast to northwest. The development of new urbanization in the Yellow River Basin should build a regional coordinated development system, accelerate the transformation and upgrading of industrial structure, coordinate urban and rural development, and promote the sustainable development of the human land system in the Yellow River Basin.关键词：urban population;urban land;correlation pattern;regional type;Yellow River Basin
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发布时间：2024-06-17 - 摘要：On the basis of the fifth, sixth and seventh national population census data, we identify the shrinking cities in the Yellow River Basin and measure their shrinkage intensity. The multi-index comprehensive evaluation method and the coupling coordination model were used to analyze the size of the " production-living-ecological" functions and the coupling coordination scheduling of shrinking cities in 2010, 2015 and 2020. We also use the random forest model to explore its key influencing factors. The results show that among the 90 prefecture-level cities (stages and leagues) in the Yellow River Basin, there are 27 continuous contracting cities, 9 stage contracting cities and 29 potential contracting cities. The phenomenon of urban contraction is significant. During the study period, the production and living functions of the shrinking cities in the Basin were on the rise as a whole, and the level of " production-living-ecological" functions in different regions was significantly different. The coupling coordination degree of the shrinking cities’ " production-living-ecological" functions was characterized by the development from barely coordinated to primary coordinated development. The coordination degree of the middle and lower reaches was better than that of the upper reaches. The development of economic society and the improvement of people’s living standards contributed to the coupling and coordinated development of the " production-living-ecological" functions.关键词：shrinking cities;"production-living-ecological" functions;coupling and coordination;random forest;Yellow River Basin
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发布时间：2024-06-17 - 摘要：The high-quality development of rural tourism in the Yellow River Basin has become a powerful starting point for the implementation of the rural revitalization strategy and the ecological protection and high-quality development strategy of the Yellow River Basin. In this study, 386 key villages of rural tourism in the Yellow River Basin were used as sample points, and geospatial analysis methods were used to study the spatial pattern and differences of rural tourism and its network attention in the Yellow River Basin. It is found that: ① The key villages of rural tourism in the Yellow River Basin and their network attention are concentrated in spatial distribution. The key villages of rural tourism have formed five major agglomeration areas in the Ganqing junction area, northern Ningxia, northern Henan, central Shandong and central Sichuan, and the network attention is concentrated in central Shandong, central Sichuan, northern Ningxia and central Shaanxi, while the attention of Inner Mongolia, western Gansu and western Qinghai is low, and no obvious agglomeration has been formed. ② There were spatial differences in the agglomeration distribution of rural tourism key villages and network attention, the key villages of rural tourism in central Shandong, central Sichuan and northern Ningxia showed high concentration, the key villages of rural tourism in Ganqing junction were clustered but the network attention was low and scattered, the number of rural tourism key villages in central Shaanxi was small but the network attention was highly concentrated, and the spatial agglomeration and network attention of key villages in Inner Mongolia, western Qinghai and northern Shaanxi were low. ③ There were obvious differences in spatial correlation between key villages of rural tourism and their network attention, and the distribution of cold and hot spots in key villages of rural tourism in the Yellow River Basin and the distribution of cold and hot spots of network attention were inverted. According to the conclusions of the study, the suggestions for the optimization of the spatial pattern and marketing management of rural tourism are put forward.关键词：rural tourism;spatial pattern;Yellow River Basin
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发布时间：2024-06-17 - 摘要：In order to effectively identify the power source and new growth point of the tourism economy development trend of high quality development in the nine provinces and regions along the Yellow River, using entropy method, exploratory spatial data analysis and geographic detector analysis to measure the development potential of the tourism economy in the nine provinces and regions along the Yellow River, and analyzes its spatial differentiation characteristics and influencing factors. The results showed that: ① there was a significant gap in the comprehensive potential level of tourism economic development in nine provinces and regions in the Yellow River Basin, while the gap between neighboring provinces and regions was small; the level of quality benefit potential and power guarantee potential is relatively small except for lower and higher values in some provinces and regions. The level of economic structural potential of all provinces and regions is low and the gap is small; ② The tourism economic development potential of nine provinces and regions showed significant differences and uneven differentiation characteristics in space, and only the comprehensive potential and economic structure potential showed significant spatial agglomeration characteristics, but the local agglomeration level was low; ③ The influencing factors of upstream and midstream and downstream development potential are quite different, the upstream power source is mainly quality and efficiency, the influencing factors of midstream and downstream development potential are more comprehensive and only environmental protection factors are not significant. The study can provide a reference for tapping the potential of tourism economy development in the Yellow River Basin.关键词：the nine provinces and regions along the Yellow River;tourism economy;potential measure;spatial differentiation;influencing factors
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发布时间：2024-06-17 - 摘要：Based on the theory of population ecology, 971 national-level characteristic protection villages in the Yellow River Basin were regarded as one geographic population. Based on GIS spatial analysis and mathematical statistics method, the distribution dynamics and habitat selection characteristics of the population were clarified, and then the ecological factors affecting the distribution of this geographic population were revealed by comparing with geographic detectors. The result shows that: ① The distribution density of characteristic protection villages in the Yellow River Basin increased significantly with population growth, the distribution pattern changed from significant aggregation to insignificant dispersion with the increase of scale, and the distribution pattern evolved from multicenter to monocenter over time, but the agglomeration center was always located in the valley basin.② The characteristic protection villages in the Yellow River Basin have the preferences of " gathering in the middle and low mountains, facing the sunny slope slopes, liking warmth and wetness, being close to the main stream of the Yellow River", and tend to be distributed in areas with medium population density and economically undeveloped areas. It is mainly located within 30 km along the national highway, 10 km along the provincial highway, 20~80 km around the center city, 60 km around the historic town, and 20 km around thetourist attractions and cultural preservation units. ③ The ecological factors influencing the population distribution of characteristic protected villages are comprehensive, non-equivalent and limited, and are dominated by cultural preservation units and altitude in the Yellow River Basin.关键词：characteristic protection villages;geographic population;spatial distribution;habitat selection;Yellow River Basin
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发布时间：2024-06-17 - 摘要：The urban agglomerations in the Yellow River Basin play a crucial role in preserving the environment and fostering high-quality development in this area. Improving the eco-efficiency of these urban agglomerations has the potential to boost their green economic growth. We approached this from the perspective of urban agglomerations and used the super-SBM model to assess the ecological efficiency of 60 cities across seven urban agglomerations in the Yellow River Basin from 2006 to 2020. Afterward, we analyzed regional differences using the Dagum Gini index and identified the key factors affecting the ecological efficiency of urban agglomerations through the panel quantile model.The results are as follows: ① Eco-efficiency has significantly improved throughout the Yellow River Basin, including all urban agglomerations. The Hu-bao-Eyu urban agglomeration and the Ningxia urban agglomeration along the Yellow River exhibited the highest eco-efficiency levels, while the Central Plains urban agglomeration and the Lanxi urban agglomeration showed the lowest eco-efficiency levels. ② The spatial distribution of eco-efficiency in the Yellow River Basin has shifted from a " clustered distribution in low-value areas, discrete distribution in high-value areas" to a " cross-distribution pattern with small clusters and large dispersion of high-value areas and low-value areas". ③ Overall disparities among the seven major urban agglomerations have decreased. The primary contributors to these differences are disparities between groups and Hypervariable density. ④ Industrial structure, population density, and openness levels constrain the ecological efficiency of urban agglomerations. In contrast, economic development levels and technological progress are positively correlated with ecological efficiency.关键词：ecological efficiency;super-SBM model;Dagum Gini index;panel quantile regression;Yellow River Basin
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发布时间：2024-06-17 - 摘要：Taking the deep lake sedimentary system of the Eocene Liushagang 2 interval in the Haizhong Depression, Beibuwan faulted lacustrine basin as an example, guided by the theory of high-resolution sequence stratigraphy, the high-frequency sequence division of the Liushagang 2 interval was carried out by means of the utilization of the maximum entropy spectrum analysis and wavelet transform analysis techniques; further, the source-reservoir intergrowth regularity of the deep lake strata in the faulted lacustrine basin was discussed, on basis of the analysis of the development rules of sedimentary system, and also the analysis of the development regularity of deep lake facies source rocks and sublacustrine fan gravity flow sandstones in the high-frequency grade-5 sequence of the Liu 2 interval. The research suggests: INPEFA spectrum analysis and wavelet transform analysis technology can be effectively applied to the high-frequency sequence division in deep lake facies strata in the faulted lake basin; the Liu 2 interval in Haizhong depression of Beibuwan Basin can be divided into one grade-3 sequence, two grade-4 sequences and five grade-5 sequences, with the grade-4 sequence being divided into two system tracts of the lake expansional system tract (TST) and the lake contraction system tract (HST), which are interfaced by the maximum flooding lake surfurce (Mfs); High-quality thick source rocks in faulted lacustrine basins were often developed in the initial grade-5 sequence at the first lake flooding surface in the lower part of the lake expansional system tract of grade-4 sequence. Although the source rocks developed in the two grade-5 sequences closely under or over the maximum lake flooding surface at the top of the lake expansional system tract of grade-4 sequence are large in areal extent, but thin in thickness, which can thus be served as the secondary source rocks and most well cap rocks. The grade-5 sequence at the middle part of the grade-4 sequence in the lake expansion system tract often developed sublacustrine fan gravity flow facies reservoirs, which are sandwiched between the two sets of source rocks nearing the initial lake flooding surface and the maximum lake flooding surface, while all these together could form a good sandwich type source-reservoir-cap assemblage, which should be a follow-up field of unconventional oil and gas prospection.关键词：high-frequency sequence;deep lake sedimentary system;source-reservoir intergrowth regularity;Beibuwan Basin;Haizhong Depression;Liu 2 Interval
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发布时间：2024-06-17 - 摘要：To explore the mineralogical characteristics and genesis of sodium feldspar by studying its petrochemistry, ore structure, and mineral combination characteristics. The volcanic clastic rocks in the area mainly belong to acidic rocks, which are rich in alkali (especially sodium) and poor in calcium, iron, and magnesium. They belong to the calcium alkaline series and are high potassium or ordinary calcium alkaline rocks. The formation of sodium feldspar deposits is related to early Cretaceous volcanic activity, where medium acidic ore bearing hydrothermal fluids were replaced by sodium rich volcanic rocks. The distribution of mineral deposits is related to regional deep and large faults, controlled by volcanic structures. Sodium rich acidic rocks are favorable ore-forming parent rocks. The circular fracture zones at the edge of volcanic structures and the contact zones of different rock facies are favorable ore conducting and hosting structures. Sodium rich magma provides heat and material sources. The genesis of the deposit belongs to the volcanic (magmatic) hydrothermal alteration type sodium feldspar deposit.关键词：sodium feldspar rock;petrochemistry;mineralogy;genesis of mineral deposits
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发布时间：2024-06-17 - 摘要：Based on core and thin section observations, as well as statistical analyzes of sandstone thickness and percentage of sandstone content from 1446 wells, we analyzed the coastal changes and control factors of the microfacies type, planar morphology and distribution of the Benxi Fm sandbodies in the Yanchang gas field. The results indicate that the Benxi Fm of the Yanchang gas field is generally composed of terrigenous coastal clastic barrier deposits in a medium to small tidal range environment, but the wave action in the southern region is weak, forming typical barrier sandbars and backbarrier deposits. The wave actions in the north change more strongly, forming three major microfacies sandbodies: reworked barriers, shoals and incised valley filled tidal channels. The barrier sandbodies are arranged in a belt or bead-like pattern parallel to the shoreline and are distributed longshore near the provenance. The oval-shaped shoal sandbodies are dispersed further from the shoreline, and the filling of tidal channel sandbodies is controlled by ancient geomorphic grooves. This research has important guiding significance for the identification and evaluation of reservoirs in the Yanchang gas field and similar geological settings.关键词：strong wave barrier;weak wave barrier;shoal;tidal channel;sand body dimensionand distribution
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发布时间：2024-06-17
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