Field experimental study on the effect of thawed depth of frozen alpine meadow soil on rill erosion by snowmelt waterflow
作者机构:State Key Laboratory of Tibetan Plateau Earth SystemResources and Environment(TPESRE)Institute of Tibetan Plateau ResearchChinese Academy of SciencesBeijing100101China University of Chinese Academy of SciencesBeijing100101China State Key Laboratory of Hydrology-Water Resources and Hydraulic EngineeringHohai UniversityNanjing210098China College of Water Resources and Civil EngineeringChina Agricultural UniversityBeijing100083China College of Geographic ScienceHunan Normal UniversityChangsha410081China
出 版 物:《International Soil and Water Conservation Research》 (国际水土保持研究(英文))
年 卷 期:2024年第12卷第1期
页 面:54-63页
核心收录:
学科分类:0830[工学-环境科学与工程(可授工学、理学、农学学位)] 082802[工学-农业水土工程] 090707[农学-水土保持与荒漠化防治] 0907[农学-林学] 08[工学] 0828[工学-农业工程] 09[农学] 0903[农学-农业资源与环境] 0815[工学-水利工程]
基 金:This study is financially supported by the National Natural Science Foundation of China(Grant No.42271142,42101130) the Belt and Road Special Foundation of the State Key Laboratory of Hydrology-Water Resources and Hydraulic Engineering(2020490311)
主 题:Snowmelt waterflow erosion Hillslope erosion process Soil freeze and thaw Runoff generation In situ experimental method
摘 要:Soil erosion by snow or ice melt waterflow is an important type of soil erosion in many high-altitude and high-latitude regions and is further aggravated by climate *** snowmelt waterflow erosion process is affected by soil freeze-thaws and is highly dynamically *** this study,a methodology was developed to conduct in situ field experiments to investigate the effects of the thawed depth of the frozen soil profile on snowmelt waterflow *** method was implemented on an alpine meadow soil slope at an altitude of 3700 m on the northeastern Tibetan *** erosion experiments involved five thawed soil depths of 0,10,30(35),50,and 80(100)mm under two snowmelt waterflow rates(3 and 5 L/min).When the topsoil was fully frozen or shallow-thawed(≤10 mm),its hydrothermal and structural properties caused a significant lag in the initiation of runoff and delayed soil erosion in the initial *** runoff and sediment concentration curves for fully frozen and shallow-thawed soil showed two-stage patterns characteristic of a sediment supply limited in the early stage and subject to hydrodynamic-controlled processes in the later ***,this effect did not exist where the thawed soil depth was greater than 30 *** deep-thawed cases(≥30 mm)showed normal hydrograph and sedigraph patterns similar to those of the unfrozen *** findings of this study are important for understanding the erosion rates of partially thawed soil and for improving erosion simulations in cold regions.