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[1]CAO Yan,WANG Jie,CHAI Suying,et al.Analysis on the Influence Factors on Surface Runoff in the Urban Area of Kunming City[J].Research of Soil and Water Conservation,2019,26(02):139-144,152.

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Analysis on the Influence Factors on Surface Runoff in the Urban Area of Kunming City

Research of Soil and Water Conservation[ISSN 1005-3409/CN 61-1272/P] Volume: 26 Number of periods: 2019 02 Page number: 139-144,152 Column: Public date: 2019-04-28

Title:: Analysis on the Influence Factors on Surface Runoff in the Urban Area of Kunming City

Author(s):: CAO Yan¹, WANG Jie¹, CHAI Suying², QI Na¹; 1. Yunnan Institute of Water Resources and Hydropower Research, Kunming 650228, China;
2. Yunnan Institute of Environmental Science, Kunming 650034, China

Keywords:: SCS model; rainfall; surface runoff; soil humidity; land use

CLC:: P333.1;P343.9

DOI:: -

Abstract:: In order to explore the applicability and influence factors of surface runoff base on SCS model in Kunming dam area, based on land use data and daily rainfall data of 5 meteorological stations in Kunming City in 1986, 1995, 2000, 2007 and 2014, the influence factors on surface runoff were analyzed by modified SCS model in the urban area of Kunming City. The simulated results showed that the modeled runoff depth significantly linearly increased with the increase of rainfall, the runoff depth decreased in the order: high flow year > partial high flow year > normal flow year > Low flow year, the maximum rainfall runoff occurred in the month with most rainfall (June or July), the average monthly rainfall reached up to 20 events, the daily average runoff was 3.41 million m³, the minimum rainfall runoff occurred in the month with Less rainfall (January or December). There were distinct variations in runoff depth when rainfall intensity varied between different rainfalls, the coefficient of surface runoff rapidly increased with the increase of rainfall intensity. In terms of single rainfall and unit millimeter rainfall, the surface runoff increased with the increase soil moisture. Surface runoff increased with decrease of proportion of permeability area, in term of annual surface runoff, land use change had more significant impact on it in wet years than that on dry years.

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