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Construction of a Multispectral Satellite-Based Retrieval Algorithm for Chlorophyll-a Concentration in Typical Lake Water Bodies of Henan Province
Characteristics Variation and Monitoring Optimization of Total Nitrogen Driven by Rainfall-Runoff
Research Progress on the Application of Machine Learning in Turbidity Prediction of Urban River Water
Analysis of Navigation Conditions and Flood Simulation Study for the Zhoukou-Jieshou Section of the Shaying River
Spatiotemporal Variation of Vegetation in the Shaying River Basin and Its Response to Meteorological Factors
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Evaluation Method of Coupling Coordination Degree of Regional Water Resources Carrying Capacity Based on Set Pair Reasoning
JIN Juliang;SHEN Shixing;WU Chengguo;ZHOU Liangguang;ZHOU Rongxing;CUI Yi;【Objective】 This study aims to enhance the logical rationality and physical interpretability of the evaluation method for the coupling coordination degree between the support and pressure subsystems of regional water resources carrying capacity, while ensuring the consistency in dimension types and orders of magnitude changes between the coupling coordination degree evaluation results and the comprehensive evaluation levels of the subsystems of regional water resources carrying capacity. 【Methods】 The comprehensive evaluation level of each subsystem was characterized using the identity-discrepancy-contrary connection numbers. Based on the common overall objective of coupling and coordination among subsystems, a set pair reasoning method was constructed based on the logical multiplication operation of two identity-discrepancy-contrary connection numbers. The subtractive set pair potential of the connection number obtained from the multiplication operation of the connection numbers of the two subsystems was taken as the evaluation value of the coupling coordination degree between subsystems. A regional evaluation method of coupling coordination degree of water resources carrying capacity based on set pair reasoning(ECCD-SPR) was established and applied to 16 prefecture-level cities in Anhui Province. 【Results】 The application results of ECCD-SPR indicated that the coupling coordination degree of water resources carrying capacity in Anhui Province showed a spatial distribution characteristic of gradually increasing from northern Anhui to central Anhui and southern Anhui. The evaluation value of the coupling coordination degree was consistent with the dimension types and orders of magnitude changes of the comprehensive level values of the subsystems, and the evaluation values showed strong discriminative capability. 【Conclusion】 ECCD-SPR deepens the coupling coordination degree from a state index describing the correlation strength between subsystems to an analytical index revealing the multiplication effect between the connection numbers of set pairs of subsystems. It reveals the principle of set pair multiplication coupling coordination in the water resources-economic society-ecological environment composite system. This method expands the quantitative calculation approach of water resources set pair reasoning and holds application prospects in the field of coupled coordination analysis such as between regional ecological conservation and high-quality development.
Hydrological Characteristics of Urumqi Glacier No.1 at Headwaters of Urumqi River Based on Wavelet Analysis
HOU Duoduo;HAO Huiqing;LI Zhongqin;JIA Yufeng;Teligeer;CAO Yongqiang;HAO Yonghong;【Objective】 This study aims to reveal the evolution patterns of the hydrological processes of Urumqi Glacier No.1 at the headwaters of Urumqi River in the Tianshan Mountains and their response mechanisms to meteorological factors, providing a scientific basis for regional water resources management and climate change adaptation. 【Methods】 The Mann-Kendall(M-K) test was applied to analyze the mass balance time series of Glacier No.1 from 1989 to 2019 to identify years with abrupt changes and variation trends. Glacier No.1 was divided into accumulation zone and the ablation zone according to the equilibrium line altitude(ELA). Wavelet analysis was employed to examine the periodicity, frequency, and phase characteristics of the glacier hydrological processes. 【Results】(1) Abrupt changes in the mass balance of Glacier No.1 occurred in 1993 and 1996, and the overall trend showed a continuous decline.(2) The mass balance in both the accumulation zone and the ablation zone exhibited multi-scale responses to precipitation and air temperature, dominated by a 1-year resonance period, with a lag response of approximately 6 months.(3) The mass balance in the ablation and the accumulation zone showed resonance at a short period of 6 months and a long period of 1 year. The hydrological transfer process between the two zones exhibited an immediate response effect.(4) The effects of precipitation, mass balance in the ablation zone, and evaporation on the total runoff in the glacier area all showed a 1-year resonance period. The response of total runoff lagged behind precipitation and evaporation by 1-2 months, and lagged behind glacial meltwater by approximately 6 months. 【Conclusion】 The mass balance of Glacier No.1 exhibits staged abrupt changes and a persistent deficit trend. Its hydrological processes display multi-scale resonance characteristics, with differentiated lagged responses among hydrological variables, revealing the buffering and regulating role of glaciers in runoff generation. Under the context of global warming, particular attention should be paid to the delayed contribution of glacial meltwater to runoff, and long-term in-situ monitoring of multiple glacial-hydrological elements should be strengthened.
Regulation and Simulation of Generalized Water Resources in Yanhe River Basin
XIA Fan;LI Xinsheng;JIA Dongdong;XU Yao;QIU Huiyang;HUANG Xiaodong;SU Yanmei;【Objective】 This study aims to analyze the key factors affecting the regional water supply-demand balance and develop evidence-based management strategies, thereby providing theoretical support and practical pathways for promoting sustainable water use and high-quality regional development. 【Methods】 Based on water footprint and blue-green water frameworks, this study innovatively explored the mechanisms of water resources stress in the river basin from a holistic view of water resources. Taking the Yanhe River Basin as an example, the Soil and Water Assessment Tool(SWAT) model was employed to calculate basin-scale blue and green water volume, which was then coupled with a system dynamics model. Four future scenarios-natural development, water-resource-focused regulation, economic-growth-driven development, and ecological-priority management-were designed to quantitatively analyze their impacts on water resources carrying capacity, thereby proposing regulation strategies to enhance water resources carrying capacity. 【Results】 The SWAT model achieved R2 and Nash-Sutcliffe Efficiency(NSE) values of 0.69 and 0.61 during the calibration period, and 0.88 and 0.78 during validation, indicating good simulation accuracy. The multi-year average blue water volume was 1.408 billion m3, and the multi-year average green water volume was 3.193 billion m3, highlighting green water as the dominant component of the river basin′s water resources. By 2035, agricultural, industrial, domestic, and ecological water demands in the river basin were projected to increase, with the projected blue water supply reaching only 93 million m3. Under the water-resource-focused regulation scenario, the supply-demand gap was minimized, averaging 5.9 million m3. However, apple and vegetable yields deviated from the planned targets by 361 300 t and 352 700 t, respectively, and industrial output was 2.213 billion yuan lower, indicating constraints on industrial and agricultural development. Under the economic-growth-driven development scenario, the supply-demand gap was the largest, averaging-52.2 million m3, further intensifying supply-demand pressure. In contrast, the results under the ecological-priority management scenario aligned closely with the planned targets, yielding an average supply-demand gap of-12.9 million m3. 【Conclusion】 The ecological-priority management scenario achieves a water supply-demand ratio of 1.33, and the simulated values of subsystems are generally consistent with the long-term development goals. This scenario effectively achieves a dynamic balance among ecological protection, economic development, and water resources utilization, serving as a strategic reference for high-quality development in the Yanhe River Basin in the future.
Study on Characteristics and Driving Factors of Water and Sediment Fluxes of Five Rivers into Poyang Lake
YU Yang;YAO Yi;YANG Guang;LI Chentao;XIA Chen;【Objective】 This study aims to reveal the long-term variation patterns, abrupt change characteristics, and driving factors of water and sediment fluxes of the five rivers into Poyang Lake, thereby providing scientific support for basin water resources management and water-sediment regulation strategies. 【Methods】 Based on runoff, sediment load, precipitation, and temperature data of the five rivers from 1960 to 2018, cumulative anomaly analysis, Mann-Kendall trend tests, Morlet wavelet analysis, and double mass curve methods were employed to systematically analyze the trends, abrupt change years, periodic features, and the contributions of climate change and human activities to water and sediment flux variations. 【Results】(1) The runoff from the five rivers into Poyang Lake remained generally stable throughout the study period, showing no significant long-term trend, whereas the sediment load declined markedly, with 1995 identified as the year of abrupt change and a reduction rate of 64.26%.(2) Runoff was dominated by short-term cycles of less than 10 years, associated with the regional monsoon climate, while sediment load showed long-term cycles exceeding 10 years, reflecting combined driving factors of climate change and human activities.(3) During the baseline period(1960-1995), the precipitation-sediment relationship remained stable. However, in the change period(1995-2018), the actual sediment load was much lower than the theoretical value, indicating that human activities significantly reduced sediment load per unit of precipitation.(4) Double mass curve analysis showed a stable precipitation-runoff relationship, whereas the slope of the precipitation-sediment relationship decreased significantly after 1995, indicating that sediment retention by reservoirs, soil and water conservation measures, and sand mining management were the dominant factors driving the sediment decline. 【Conclusion】 The sediment load processes of the five rivers into Poyang Lake have undergone significant changes after 1995, with human activities exerting a stronger regulatory effect than the direct impacts of climate change. Future basin management should integrate reservoir operation optimization, soil and water conservation projects, and sand mining control policies to enhance long-term sediment management and support ecological security in the Poyang Lake Basin.
Comprehensive Evaluation of Hydraulic Regulation of Middle Route of South-to-North Water Diversion Project Based on Variable Cloud Model
CHEN Xiaonan;LU Minglong;ZHAO Hui;WU Miao;XU Xinyong;ZHANG Zhao;North China University of Water Resources and Electric Power;China Institute of Water Resources and Hydropower Research;【Objective】 This study conducts a comprehensive evaluation of the hydraulic regulation of the South-to-North Water Diversion Middle Route Project(SNWD-MRP) to provide scientific support for precise scheduling decision-making. 【Methods】 Considering factors such as water level control objectives, water level decline constraints, gate regulation frequency, and response time, a hydraulic regulation evaluation system for the SNWD-MRP was established. A variable cloud comprehensive evaluation model based on a triangular distribution was developed through the integration of variable fuzzy set theory and cloud theory. Ten typical hydraulic regulation schemes for water transfer of the SNWD-MRP were evaluated and selected. 【Results】(1) Scheme 3 was relatively the best, with a comprehensive grade value of 2.76 and an evaluation grade of good. Scheme 6 was relatively the poorest, with a comprehensive grade value of 4.09 and an evaluation grade of relatively poor.(2) The evaluation grade of most scheduling schemes was average, and the comprehensive grade values were between 3.02 and 3.52, which reflected the conflict among different evaluation indicators.(3) The ranking results showed that safety-critical indicators, such as water level thresholds and fluctuation controls, had a significant influence on the evaluation of the schemes, which was consistent with the safety-first principle in the operation scheduling of the SNWD-MRP. 【Conclusion】 The variable cloud comprehensive evaluation model can effectively quantify and evaluate various scheduling schemes, and rank them accordingly. In the future, combined with the construction of digital twin technology, further research on the optimization and real-time control of regulation models can be conducted to provide technical support for intelligent scheduling of the SNWD-MRP.
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