Thresholds of geographic environmental elements in sediment yield of drainage basins
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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.
Keywordsmiddle Yellow River environmental element sediment sediment delivery mudule threshold
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- 1.Walling, D. E., Kleo, A. H. A., Sediment yields of rivers in areas of low Precipiation: A global view, in proceedings of the Canberra Symposium, Canberra IAHS Publ., 1979, 128: 479–93.Google Scholar
- 3.Jing Ke, Erosional Environment Characteristics and Changing Tendencies of the Middle Yellow River Basin (in Chinese), Zhengzhou: Yellow River Water Conservancy Publishing House, 1997, 65–71.Google Scholar
- 4.Yin Guokang, Drainage Geomorphologic System (in Chinese), Nanjing: Nanjing University Press, 1991, 142–125.Google Scholar
- 5.Dendy, F. E., Boiltion, G. C., Sediment yield-runoff-drainage area relationships in the United States, J. Soil Wat. Conserv., 1976, 32: 264–6.Google Scholar
- 6.Wilson, L., Variations in mean annual sediment yield as a function of mean annual precipitation, Amer. J. Science, 1971, 273: 335–49.Google Scholar
- 7.Zhu Zhihui, A model for estimating net primary productivity of natural vegetation, Chinese Science Bulletin, 1993, 38(22): 1913–1917.Google Scholar
- 8.Integrated Survey Team to the Loess Plateau, CAS, Resources Environment and Socio-economic Data Set of the Loess Plateau Region (in Chinese), Beijing: China Economic fnPress, 1992, 179.Google Scholar
- 9.Zhang Shengli, Li Zhou, Zhao Wenlin, Causes of Water-Sand Changes and Development Trend in Coarse Sediment Producing Area of the Middle Yellow River (in Chinese), Zhengzhou: Yellow River Water Conservancy Publishing House, 1998, 11–19.Google Scholar
- 10.Xu Jiongxin, Optimal grain-size composition of hyperconcentrated flows in high-intensity coarse sediment producing area of the middle Yellow River basin and its implications in geomorphology, Sediment Research (in Chinese), 1999, (5): 13–17.Google Scholar
- 11.Xu Jiongxin, A study on the coupling relation between the water and sediment yield sub-system and river channel deposition sub-system: an example from the Yellow River, Acta Geographica Sinica (in Chinese), 1997, 52(5): 421–429.Google Scholar