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Investigation of rainfall-runoff and sediment yield dynamics under varying slope land use patterns in the Three Gorges Reservoir Area of China
Land Degradation & Development ( IF 3.6 ) Pub Date : 2024-07-29 , DOI: 10.1002/ldr.5242 Xianmeng Meng 1 , Yan Zhu 1 , Ruohui Shi 1 , Maosheng Yin 2 , Dengfeng Liu 3
Land Degradation & Development ( IF 3.6 ) Pub Date : 2024-07-29 , DOI: 10.1002/ldr.5242 Xianmeng Meng 1 , Yan Zhu 1 , Ruohui Shi 1 , Maosheng Yin 2 , Dengfeng Liu 3
Affiliation
Field experiments were conducted on various runoff plots within the Zhangjiachong watershed, located in the Three Gorges Reservoir Area, to study rainfall-runoff processes and sediment yields under different slope land use patterns. A hillslope run-on model considering vegetation interception was used to simulate runoff generation and concentration. A slope erosion model including raindrop erosion, sheet erosion, and rill erosion was developed to estimate sediment yield and concentration. The parameters of both models were calibrated and validated using observed runoff and sediment yield data. The results show that the runoff simulations in the validation have relative errors below 20% for all runoff plots, except those planted with crops. The saturated hydraulic conductivity of soil was found to be ca. 10% higher on slope lands with hedgerows than those without. In addition, it was about 15% higher on slope lands with crops than on slope lands with tea plants and citrus. The sediment yield was shown to be influenced by both precipitation characteristics and antecedent sediment conditions. There was a significant relationship between sheet erosion, rill erosion, and vegetation coverage, while the amount of raindrop erosion was similar across different runoff plots. The proportions of sheet and rill erosion on slope land with crops were minimal whether hedgerows existed or not. The proportions of the three main forms of soil erosion on slope lands with tea plants and citrus were more or less the same under concentrated rainfall. For more evenly distributed rainfall, raindrop erosion was the primary form on slope lands with hedgerows-tea plants and citrus. The proportions of sheet and rill erosion significantly increased on slope lands without hedgerows.
中文翻译:
三峡库区不同坡地利用方式下降雨径流产沙动态调查
在三峡库区张家冲流域内的多个径流样地进行了田间试验,研究了不同坡地利用模式下的降雨径流过程和产沙量。使用考虑植被拦截的山坡径流模型来模拟径流的产生和集中。开发了包括雨滴侵蚀、片状侵蚀和细沟侵蚀的坡度侵蚀模型来估计泥沙产量和浓度。使用观测到的径流和产沙数据对两个模型的参数进行了校准和验证。结果表明,除了种植农作物的地块外,所有径流地块验证中径流模拟的相对误差均低于 20%。发现土壤的饱和导水率约为。有树篱的坡地比没有树篱的坡地高 10%。此外,种植农作物的坡地比种植茶树和柑橘的坡地高约15%。研究表明,沉积物产量受到降水特征和先前沉积条件的影响。片状侵蚀、细沟侵蚀和植被覆盖度之间存在显着关系,而不同径流地块的雨滴侵蚀量相似。无论是否存在树篱,有农作物的坡地上的片状侵蚀和细沟侵蚀的比例都很小。集中降雨条件下,茶树和柑橘坡地三种主要土壤侵蚀形式所占比例基本相同。为了使降雨分布更加均匀,在有树篱、茶树和柑橘的坡地上,雨滴侵蚀是主要形式。在没有树篱的坡地上,表侵蚀和细沟侵蚀的比例显着增加。
更新日期:2024-07-29
中文翻译:
三峡库区不同坡地利用方式下降雨径流产沙动态调查
在三峡库区张家冲流域内的多个径流样地进行了田间试验,研究了不同坡地利用模式下的降雨径流过程和产沙量。使用考虑植被拦截的山坡径流模型来模拟径流的产生和集中。开发了包括雨滴侵蚀、片状侵蚀和细沟侵蚀的坡度侵蚀模型来估计泥沙产量和浓度。使用观测到的径流和产沙数据对两个模型的参数进行了校准和验证。结果表明,除了种植农作物的地块外,所有径流地块验证中径流模拟的相对误差均低于 20%。发现土壤的饱和导水率约为。有树篱的坡地比没有树篱的坡地高 10%。此外,种植农作物的坡地比种植茶树和柑橘的坡地高约15%。研究表明,沉积物产量受到降水特征和先前沉积条件的影响。片状侵蚀、细沟侵蚀和植被覆盖度之间存在显着关系,而不同径流地块的雨滴侵蚀量相似。无论是否存在树篱,有农作物的坡地上的片状侵蚀和细沟侵蚀的比例都很小。集中降雨条件下,茶树和柑橘坡地三种主要土壤侵蚀形式所占比例基本相同。为了使降雨分布更加均匀,在有树篱、茶树和柑橘的坡地上,雨滴侵蚀是主要形式。在没有树篱的坡地上,表侵蚀和细沟侵蚀的比例显着增加。