Development stage threshold of watershed landforms in Loess Plateau and separation of erosion mechanism |
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Authors: | Lu Zhong-chen Chen Shao-feng Yuan Bao-yin Chen Hao |
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Institution: | 1. Eco-Environment Research Center, CAS, Beijing 100085, China 2. Institute of Policy and Management Science, CAS, Beijing 100080, China 3. Institute of Geology, CAS, Beijing 100029, China 4. Institute of Geographic Sciences and Natural Resources Research, CAS, Beijing 100101, China |
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Abstract: | Threshold is a limit and marginal point when a qualitative change takes place. Since threshold principle was firstly used
in landform research by S.A.Schumm in the 1970s, the quantitative research on watershed landform development stage has come
true. Davis proposed a three-stage model on landform evolution: young, mature and old stages. Thereafter Strahler quantified
this model by hypsometric analysis method. The authors thought that the material movement stage cannot be expressed by hypsometric
method in watershed landform at development stage, because of the uncertainty on stage delimitation. To meet this shortcoming,
this paper presents an integral erosion value method. A clear delimitation on landform development stage in the Loess Plateau
region has been tested by this method. The result shows that gullied loessial hilly area is at the mature stage, and gullied
loessial tableland area is at the young stage. It is estimated that from the point of erosion related sediment yield, natural
erosion accounts for 70% of the total erosion amount, and artificial accelerating erosion is 30%. Therefore soil and water
conservation is very crucial for the Loess Plateau. |
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Keywords: | landform development stage hypsometric analysis method integral erosion value natural erosion artificial accelerating erosion |
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