| Natural runoff changes in the Yellow River Basin |
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| 作者姓名： | LI Chunhui YANG Zhifeng |
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| 作者单位： | 1. College of Environment，Beijing Normal University，Key Laboratory for Water and Sediment Sciences，Ministry of Education，Beijing 100875，China; 2. College of Environment，Beijing Normal University，State Key Laboratory of Water Environment Simulation，Beijing 100875，China |
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| 基金项目： | National Key Research Program of Basic Science，No.G1999043605 |
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| 摘 要： | 1IntroductionThe driving factors of runoff changes can be divided into precipitation factor and non-precipitation factor, and they can also be divided into natural factor and human activity factor. The influence of the natural factor includes precipitation reduction, precipitation features (for example, spatio-temporal distribution and intensity), landuse natural changes and so forth. All of these can cause runoff changes. Temperature, evaporation, topography, soil and geological environment i…
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| 收稿时间： | 6/8/2004 12:00:00 AM |
| 修稿时间： | 10 September 2004 |
Natural runoff changes in the Yellow River Basin |
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| LI Chunhui,YANG Zhifeng,.Natural runoff changes in the Yellow River Basin[J].Journal of Geographical Sciences,2004,14(4):427-436. |
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| Authors: | LI Chunhui YANG Zhifeng |
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| Institution: | (1) College of Environment, Beijing Normal University, Key Laboratory for Water and Sediment Sciences, Ministry of Education, 100875 Beijing, China;(2) College of Environment, Beijing Normal University, State Key Laboratory of Water Environment Simulation, 100875 Beijing, China |
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| Abstract: | The driving factors of runoff changes can be divided into precipitation factor and non-precipitation factor, and they can
also be divided into natural factor and human activity factor, In this paper, the ways and methods of these driving factors
impacting on runoff changes are analyzed at first, and then according to the relationship between precipitation and runoff,
the analytical method about impacts of precipitation and non-precipitation factors on basin’s natural runoff is derived. The
amount and contribution rates of the two factors impacting on natural runoff between every two adjacent decades during 1956–1998
are calculated in the Yellow River Basin (YRB). The results show that the amount and contribution rate of the two factors
impacting on natural runoff are different in different periods and regions. For the YRB, the non-precipitation impact is preponderant
for natural runoff reduction after the 1970s. Finally, by choosing main factors impacting on the natural runoff, one error
back-propagation (BP) artificial neural network (ANN) model has been set up, and the impact of human activities on natural
runoff reduction in the YRB is simulated. The result shows that the human activities could cause a 77 × 108 m3·a-1 reduction of runoff during 1980–1998 according to the climate background of 1956–1979. |
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| Keywords: | natural runoff precipitation non-precipitation natural factor human activities the Yellow River Basin (YRB) |
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