Response of Erosion and Sediment Producing Processes to Soil and Water Conservation Measures in the Wudinghe River Basin
Received date: 2004-05-21
Revised date: 2004-09-27
Online published: 2004-11-25
Supported by
National Natural Science Foundation of China, No.50239080; No.40271019
Based on data from the Wudinghe River, a tributary of the Yellow River in the major coarse sediment source area of the middle Yellow River Basin, a study has been made of the effect of soil and water conservation measures on sediment yield in the condition of changing precipitation. Both annual sediment load and annual river flow show a decreasing trend with time, and the areas of soil and water conservation measures. The area-weighted annual and high-flow season precipitations over the drainage basin also show a mild trend of decreasing, less significant than the above variables. It has been found that specific sediment yield is negatively correlated with the areas of land terracing, tree planting and grass planting. The period between 1956 and 1969 and the period between 1970 and 1996 are taken as "baseline" period without measures and the compared period with measures, respectively. Comparison between these two periods indicates that, during the former period, the percentages of the variation in specific sediment yield, runoff to precipitation ratio and high-flow season water yield can be explained by the variation in precipitation were 69%, 80% and 77%, respectively. However, in the latter period, these percentages decreased to 26%, 31% and 54%, respectively. This change means that, in the latter period, soil and water conservation measures played a great role, and thus the contribution of the variation in precipitation to the variation in sediment yield was greatly reduced. Based on the 41-year data from 1956 to 1996, a multiple regression equation has been established.
Key words： erosion; sediment; soil and water conservation; Loess Plateau; Wudinghe River
XU Jiongxin . Response of Erosion and Sediment Producing Processes to Soil and Water Conservation Measures in the Wudinghe River Basin[J]. Acta Geographica Sinica, 2004 , 59(6) : 972 -981 . DOI: 10.11821/xb200406021
[1] Ye Q C (ed.). Researches on Environmental Changes of the Yellow River Basin and Laws of Water and Sediment Transportation. Jinan: Shandong Science and Technology Press, 1994. 1-220.
[2] Xu J H, Niu Y G. Effect of Hydraulic Engineering Works on River flow and Sediment Load in the Middle Yellow River Basin. Zhengzhou: Publishing House for Yellow River Water Conservancy, 2000. 1-296.
[3] Ran D C. Water and Sediment Changes in Relation with Soil and Water Conservation Measures in the Middle Yellow River Basin. Zhengzhou: Publishing House for Yellow River Water Conservancy, 2000. 1-274.
[冉大川. 黄河中游河口镇至龙门区间水土保持与水沙变化. 郑州: 黄河水利出版社, 2000. 1-274.]
[4] Wang G. A Study of Water and Sediment Changes in the Yellow River (Vol.1). Zhengzhou: Publishing House of Yellow River Water Conservancy, 2003.
[汪岗. 黄河水沙变化研究(第1卷). 郑州: 黄河水利出版社, 2003.]
[5] Wang G. A Study of Water and Sediment Changes in the Yellow River (Vol. 2). Zhengzhou：Publishing House of Yellow River Water Conservancy, 2003.
[汪岗. 黄河水沙变化研究 (第2卷). 郑州: 黄河水利出版社, 2003.]
[6] Tang K L (ed.). Regional Characteristics of Soil Erosion on the Loess Plateau and Its Control. Beijing: China Science and Technology Press, 1989. 1-246.
[7] Chien N. The source of coarse sediment in the middle reaches of the Yellow River and its effect on the siltation of the lower Yellow River. In: Chinese Society of Hydraulic Engineering (ed.), Proceedings of the 1st International Symposium on River Sedimentation held in Beijing. Beijing: Guanghua Press, 1980. 53-62.
[8] Zhang J J. Water and sediment changes in the Wudinghe River: present state, formative cause and tendency in the future. In: Wang G, Fan Z (eds.), A Study of Water and Sediment Changes in the Yellow River (Vol.2). Zhengzhou: Publishing House of Yellow River Water Conservancy, 2003. 393-429.
/
| 〈 |
|
〉 |