Threshold of environmental elements in drainage basin sediment yield refers to,under effect of climate,underlying surface and human activity,a turning point of abrupt changes in drainage sediment yield related to envi...Threshold of environmental elements in drainage basin sediment yield refers to,under effect of climate,underlying surface and human activity,a turning point of abrupt changes in drainage sediment yield related to environmental element characteristics.Previous studies on threshold of sediment yield of relevant drainage basins were mainly concentrated on impact of natural zones with a few researches on impact of other environmental elements.Particularly studies on compound environmental element threshold in drainage basin sediment yield remain blank today.Studies indicate that sediment yield in drainage basins is affected by compound interactions and complex actions.Based on single element analysis,the present paper gives quantitatively compound threshold of environmental elements affecting sediment yield of the drainage basin between Hekouzhen and Tongguan in the middle Yellow River by the method of multi-variant,polynomial formula regression analysis.展开更多
基金supported by the State Key Basic Research Development Project(Grant No.1999043604)the National Natuural Science F oundation of China(Grant No.40471085)+1 种基金the Joint Proj ect of the National Natural Science Foundation of Chinathe Yellow River Water Conservancy Committee(50239080).
文摘Threshold of environmental elements in drainage basin sediment yield refers to,under effect of climate,underlying surface and human activity,a turning point of abrupt changes in drainage sediment yield related to environmental element characteristics.Previous studies on threshold of sediment yield of relevant drainage basins were mainly concentrated on impact of natural zones with a few researches on impact of other environmental elements.Particularly studies on compound environmental element threshold in drainage basin sediment yield remain blank today.Studies indicate that sediment yield in drainage basins is affected by compound interactions and complex actions.Based on single element analysis,the present paper gives quantitatively compound threshold of environmental elements affecting sediment yield of the drainage basin between Hekouzhen and Tongguan in the middle Yellow River by the method of multi-variant,polynomial formula regression analysis.
