Full-Text Search:
Home|About CNKI|User Service|中文
Add to Favorite Get Latest Update

The effect of land use on runoff in Shenzhen City of China

SHI Pei Jun, YUAN Yi, CHEN Jin (Institute of Resources Science, Beijing Normal University; Key Laboratory of Environmental Change and Natural Disaster, Ministry of Education of China, Beijing Normal University, Beijing 100875,China)  
The land cover change induced by the land use of human beings is the main cause and important part of eco environment change The effect of land use on natural disasters is one of the main processes Flood disaster is one of the disasters, the number of which is most and the loss of which is the most serious The effect of land use on rainfall runoff process is studied to understand the relationship between land use and flood disaster In the flood generation process, the effect of land use pattern and intensity on runoff generation and concentration is the foundation to study the change of urban flood caused by the human activities Revealing the mechanism of land use on the flood generation is important to reduce urban flood disaster The first important issue, which should be answered, is how the land use pattern influences the change of runoff coefficient and the mechanism of runoff generation and concentration Shenzhen City has grown to a modernized city from a fishery village after it was assigned as the first Special Economic Zone in China from 1980 With more than twenty years economic reform and opening, the great changes of land use patterns in Shenzhen City are inevitable So, Shenzhen City is taken up as case study area to study runoff change due to land use change Based on the data of land use, hydrology and meteorology, SCS model, developed by Soil Conservation Service (SCS), U S A , is applied to study the rainfall runoff relationship of some rivers in Shenzhen City The following is the main conclusions of the paper: (1)Basin scale hydrologic model is a good means to study the rainfall runoff relation Remote sensing based hydrologic model is one of main developing directions of basin scale model in the future, and it has a good developing prospect Based on the simulation process and result, SCS model is a good hydrologic model to study the rainfall runoff relation in the regions being short of hydrological and meteorologic data CN value in SCS model describes the relationship between rainfall and runoff, which reflects the runoff generation capability of underlying surface unit in basins Based on the definition of SCS model, CN value is the function of land use classes, soil classes and antecedent moisture conditions (AMC) Generally, the CN value is large while the runoff is large in certain underlying surface units (2) The spatial distribution of CN value is successive, reflecting the runoff generation capability of different underlying surfaces in spatial pattern By analysing the CN contours of Shenzhen City, the spatial distribution of rainfall runoff relationship changes along with the change of land use classes, soil classes and antecedent moisture conditions of soil The regions of high values of CN are urban and water The regions of low value of CN are forest, shrub grassland and orchard, and the elevation of these regions is comparatively high According to the spatial distribution of CN contours, the land use changes caused by the urbanization is the main cause of the increase of runoff coefficient (3) According to the simulation results of storm runoff in Buji River Basin (one of the main tributaries of Shenzhen River), there are some important results Firstly, the land use is one of the main factors which effect the rainfall runoff relationship The runoff increases from 1980 to 1994, and the relative increasing magnitude ranges from 1 6% to 62 9% From 1980 to 1994, the economic development leads to the runoff coefficient transforming into high values The increase of runoff coefficient following the land use change ranges from 0 021 to 0 075 Secondly, both the rainfall and the soil antecedent moisture condition influence the effect of land use on the rainfall runoff relationship On certain antecedent soil moisture conditions, the relationship between the change of land area of different runoff coefficients in Buji River Basin and the rainfall intensities is in the order 90%50%10%, namely th
Download(CAJ format) Download(PDF format)
CAJViewer7.0 supports all the CNKI file formats; AdobeReader only supports the PDF format.
©CNKI All Rights Reserved