RESOURCES AND ENVIRONMENT IN THE YANGTZE BASIN >> 2021, Vol. 30 >> Issue (2): 342-350.doi: 10.11870/cjlyzyyhj202102009

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Spatiotemporal Responses of Runoff to Land Use Change in Fuhe River Basin

FU Chun 1 ,MAO An-qi 2   

  1. (1. School of Management, Nanchang University, Nanchang 330031, China; 2. School of Civil Engineering and Architecture, Nanchang University, Nanchang 330031, China)
  • Online:2021-02-20 Published:2021-03-18

Abstract: In order to reveal the spatial and temporal response of the Fuhe River Basin, the watershed runoff has been lasting influence on the land use in recent decades.In view of it, the land use maps have been obtained by monitoring and classification of the remote sensing images in 2003, 2010 and 2017. Meanwhile, based on SWAT model, the impacts of land use change on runoff and the quantitative analysis and studies, the results have been shown that :(1)The change of land use during the period from 2003 to 2010 and from 2010 to 2017 has been presented in a similar and consistent manner, in which the area of forest and urban land use has been increased continuously, while the remaining types of land use have been showing a decreasing trend.(2)SWAT model has been applied with a good applicability in the runoff simulation of Fuhe River Basin, in which the indicators of R2 and ENS in lijiadu hydrological station have shown greater than 0.85, while the indicators of R2 and ENS have been greater than 0.80 except the indicator for ENS has been 0.77 at shaziling hydrological station.Meanwhile, the relative error of both stations has been less than 20%. (3)According to the meteorological data during the period of 2010-2016 and other setting threshold under the same conditions, only change the land use map input, the area of the forest land has increased and the area of the cultivated land and grassland has decreased as the land use map has been entered, which has brought about the result that the average monthly runoff amount in the years of 2010 has dropped that that in 2003 by 0.65 m3/s, at the same time, the average monthly runoff amount in the 2017 years has been a decrease by 0.41 m3/s, comparing with that in 2010. The major differences have been reflected with a slight change at the early stages compared to the later stages of the years.The difference between the latter period and the former has been related to the slow growth of forest land and the rapid growth of urban land. (4)During the first stage from 2003 to 2010 and the second stage from 2010 to 2017, the runoff coefficient in the most areas of the basin has shown in a state of decline. The increase of forest and grassland area has produced an effect on the runoff coefficient with a dropping trend, while the increase of runoff coefficient has been generally caused by the increase of cultivated land, urban land area and the decrease of forest area.

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