Showing 781 - 800 results of 938 for search '"river basin"', query time: 0.08s Refine Results
  1. 781

    Mapping the priority conservation areas for three endangered Cupressaceae plants under climate change in China by Lei Shen, Lei Shen, Duanqiang Zhai, Duanqiang Zhai, Xinyong Lu, Xinyong Lu

    Published 2025-01-01
    “…Based on the effects of climate change, M. glyptostroboides priority conservation areas should be established in the Yangtze River Basin; G. pensilis priority conservation areas should be established in Guangdong, Guangxi, Fujian, and Jiangxi; and T. sutchuenensis protection districts should be established at the intersection of the northeastern part of Sichuan Province and the northern part of Chongqing. …”
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  2. 782

    Genetic Diversity and Genetic Structure of Different Types of Natural Populations in Osmanthus fragrans Lour. and the Relationships with Sex Ratio, Population Structure, and Geogra... by Shaoqing Hu, Shuai Wu, Yiguang Wang, Hongbo Zhao, Yuanyan Zhang

    Published 2014-01-01
    “…., an evergreen small tree, has the rare sexual system of androdioecy (coexistence of males and hermaphrodites), once with wide-spread natural distribution in the areas of the South Yangzi river basin. However, due to excessive human utilization, natural distribution became fragmented and the number and size of natural populations reduced sharply. …”
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  3. 783

    Response Analysis of Microbial Community Structures and Functions Under Water and Sediment Changes in the Middle and Lower Yellow River by Ji Wu, Quan Hong, Jin Zhang, Chen Xie, Yang Liu, Dandan Li, Hao Liu, Ziwu Fan

    Published 2025-01-01
    “…In summary, this study provides the biological information needed for the ecological conservation of the Yellow River basin, as well as insights into the changes in and response characteristics of microorganisms following severe disturbances in rivers with high sediment concentrations.…”
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  4. 784
  5. 785

    Short-Term Optimal Scheduling Method of Cascade Hydropower Stations Based on Segmented Load Construction Strategy by LI Chonghao, LI Shushan, TANG Hongbing, LIU Huan, MA Xiangyu, LIAO Shengli

    Published 2023-01-01
    “…With the rapid development of China's economy,electricity demand has increased.As the largest clean energy in China,hydropower has been put into large-scale and centralized production,and the most complex large-scale hydropower system in the world is formed.However,short-term hydropower optimal scheduling faces the serious challenge of the curse of dimensionality due to massive cascade hydropower stations,numerous hydropower constraints,and time-sensitive scheduling requirements.Therefore,this paper proposes a short-term optimal scheduling method for cascade hydropower stations based on a segmented load construction strategy.First,the selection rules of the hydropower stations to be regulated are formulated from the perspective of the regulation performance,location,and task of the cascade hydropower stations.Then,a method is given to divide the complex original load into two sub-load processes,namely the segmented load process with time reduction scale and the residual load process with frequent fluctuations.Finally,the adjustment method is given,and the particle swarm algorithm is used for traversal and optimization at different stages,so as to find the load division process when the target is optimal.By taking seven cascade hydropower stations in a certain river basin in southwest China as research objects,a mature particle swarm algorithm is used to simulate the typical day during the flood and dry periods.The results show that the segmented load construction strategy proposed in this paper can effectively reduce the solution complexity,and the appropriate number of segments can improve the solution efficiency while ensuring the solution quality.In addition,this method greatly reduces the output fluctuation of auxiliary hydropower stations and helps to reduce the difficulty of scheduling and unit loss.Therefore,the method proposed in this paper can provide a reference for solving the short-term scheduling of large-scale cascade hydropower stations and is of good practical value.…”
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  6. 786

    Analysis of Spatiotemporal Dynamics and Driving Factors of China’s Nationally Important Agricultural Heritage Systems by Fei Ju, Rui Yang, Chun Yang

    Published 2025-01-01
    “…The results reveal a predominantly clustered spatial distribution of China-NIAHS, centered around the Yangtze River Basin, with significant influences from population density, tourism development, and industrialization. …”
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  7. 787
  8. 788

    Design Flood Calculation Model for Extra-Small Watersheds in Ungauged Basin by Yun Wang, Zengchuan Dong, Xinhua Zhu, Wenzhuo Wang, Yupeng Liu, Ronghao Chen, Yunjia He

    Published 2025-01-01
    “…Taking the “Stormwater Runoff Chart” as the data source, the runoff generation, and concentration model was established with the design flood of Baludi Reservoir in the Gelangram River basin of Menglian, Yunnan Province as the research object. …”
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  9. 789

    Structure and formation of the Lower Cretaceous–Eocene section in the central part of the Simferopol Uplift by K.A. Dubkova, S.B. Shishlov, E.M. Bugrova, E.Yu. Zakrevskaya

    Published 2022-06-01
    “…The geological history of the Simferopol Uplift was unraveled by comparison with the outcrops of the Zuya quarry and the Bodrak River basin, facies analysis, and reconstruction of the sedimentation environments. …”
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  10. 790

    Microcrustaceans structure determined by the type and trophic state of lakes by Bharguan Pizzol Nogueira, Camila Moreira-Silva, Thaís Coimbra Marigo, Gilmar Perbiche-Neves

    Published 2025-02-01
    “…Methods The study was conducted in a segment of the Paranapanema River basin, in southeastern Brazil, focusing on five lakes spanning an eight-kilometer stretch, to understand the different organisms' responses to distinct conditions of aquatic environments. …”
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  11. 791

    Changes in Extreme Precipitation in the Mekong Basin by Lu Liu, Peng Bai, Changming Liu, Wei Tian, Kang Liang

    Published 2020-01-01
    “…Understanding historical changes in extreme precipitation is critical for disaster prevention and risk assessment. The Mekong River Basin (MB) is vulnerable to natural disasters related to extreme precipitation. …”
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  12. 792

    Control Index for Water Regulation in Fish Breeding Season for Dongta Spawning Ground after Operation of Datengxia Gorge Water Conservancy Project by LIU Lishi, WANG Li, GE Xiaoxia, TAN Xichang

    Published 2022-01-01
    “…After the operation of the Datengxia Gorge water conservancy project,the change in the hydrological rhythm of the downstream river channel may have a certain impact on the function of the Dongta spawning ground about 10 km downstream.To maintain the normal function of the Dongta spawning ground,we should analyze the hydrological rhythm process required for fish spawning and use it as a control index to implement ecological regulation of reservoirs and thus restore the ecological environment of river channels.According to the observation data of early fish resources and hydrology over the past dozen years,the correlation between early fish resources and hydrological characteristic values in the Dongta spawning ground is analyzed by different statistical methods such as grey relational analysis and linear regression.In combination with the practical experience of ecological regulation in the Xijiang River Basin,the control index requirements for water regulation during the fish breeding period by the Datengxia Gorge water conservancy project are put forward.Specifically,by the regulation of the Datengxia Gorge water conservancy project from May to July every year,when the section flow rate of Dahuangjiangkou exceeds 3 500 m<sup>3</sup>/s,the water rise duration shall be no less than four days,with the daily rise rate in the water rise stage of more than 1 000 m<sup>3</sup>/s.The time for water to recede shall be no less than three days,and the flow rate in the water recession stage shall be above 3 500 m<sup>3</sup>/s.The regulation shall be performed at least once each year.The research results can provide a technical reference for maximizing the function of the Dongta spawning ground in the fish breeding period by the regulation of the Datengxia Gorge water conservancy project.…”
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  13. 793
  14. 794

    Water Supply Risk Analysis Based on Runoff Sequence Simulation with Change Point under Changing Environment by Yafang Cheng, Ping Feng, Jianzhu Li, Yuangang Guo, Peizhen Ren

    Published 2019-01-01
    “…This study investigates the water supply risk of Panjiakou reservoir in the Luanhe River basin of China during 1956–2016 under environmental change. …”
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  15. 795

    Modelling Euphrates river water quality index based on field measured data in Al-Diwaniyah City, Iraq by Marwah M. Al-Khuzaie, Khairul Nizam Abdul Maulud, Wan Hanna Melini Wan Mohtar, Zaher Mundher Yaseen

    Published 2025-01-01
    “…The developed approach predicted HP concentration in the Euphrates River basin in an actual case study. The validation of the predictive maps between the theoretical and practical part is performed by monitoring 16 stations and conducting laboratory analyses, resulting in acceptable coefficients of determination (R2), observations standard deviation ratio (RSR), and Nash–Sutcliffe efficiency coefficients of 0.999, 1, and 0.99, respectively indicates that reliable forecast results closely match observed data from monitoring stations. …”
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  16. 796

    Multi-source meteorological data assessment on daily runoff simulation in the upper reaches of the Hei River, Northwest China by Huazhu Xue, Yaheng Wang, Guotao Dong, Chenchen Zhang, Yaokang Lian, Hui Wu

    Published 2025-02-01
    “…Study region: The upper reaches of the Hei River Basin, northwest China Study focus: To improve the accuracy and physical consistency of runoff simulations, as well as to compare the applicability of meteorological data obtained from multiple sources, this study integrates physical mechanisms with deep learning methods to construct a coupled model, HIMS-LSTM. …”
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  17. 797

    Precipitation Regulates the Assembly Processes of Rare Species in Phytoplankton Communities in River Ecosystems by Enze Xiao, Xiaofeng Liu, Tian Lou, Yimin Zhu, Yiou Wang, Xinxin Lu, Yawen Fan, Xiang Tan, Yan Liu

    Published 2024-12-01
    “…To address this knowledge gap, investigations were conducted on the environmental conditions and phytoplankton communities in the Lalin River Basin during the dry and rainy seasons. Structural equation modeling and co-occurrence network analysis were then utilized to explore the assembly processes of dominant and rare phytoplankton communities following a seasonal heavy rainfall event. …”
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  18. 798

    Rice Identification and Spatio-Temporal Changes Based on Sentinel-1 Time Series in Leizhou City, Guangdong Province, China by Kaiwen Zhong, Jian Zuo, Jianhui Xu

    Published 2024-12-01
    “…Double-cropping rice cultivation was predominantly concentrated in the Nandu River basin, while single-cropping areas were primarily distributed along rivers and irrigation facilities. …”
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  19. 799

    Mekong cooperation frameworks and geopolitical dynamics: a Cambodian perspective by Kin Phea

    Published 2024-12-01
    “…The Mekong River Basin, a lifeline for millions in Southeast Asia, faces a multifaceted challenge: balancing cooperation for sustainable development with the competing geopolitical interests of regional and global powers. …”
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  20. 800

    Effects of Different Ratios of Fly Ash and River Sand on Mechanical Properties of Cemented Paste Backfill Materials by Jiang Li, Shenggen Cao, Yang Liu, Chiyuan Che, Changzheng Zhao, Shuyu Du, Kaifei Wang, Ruiting Ma

    Published 2024-01-01
    “…Some mining areas in the Yellow River basin face a shortage of coal gangue, and these areas have abundant river sand (RS) resources. …”
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