长江流域资源与环境 >> 2021, Vol. 30 >> Issue (2): 342-350.doi: 10.11870/cjlyzyyhj202102009

• 自然资源 • 上一篇    下一篇

抚河流域径流对土地利用变化时空响应

傅  春1,毛安琪2   

  1. (1. 南昌大学管理学院,江西 南昌 330031;2. 南昌大学建筑工程学院,江西 南昌 330031)
  • 出版日期:2021-02-20 发布日期:2021-03-18

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

摘要: 为了揭示近十几年抚河流域径流对土地利用变化时空响应过程,通过2003、2010和2017年三期遥感影像图进行监督分类得到土地利用图,基于SWAT模型,定量分析和研究土地利用变化对径流的影响。结果表明:(1)2003~2010年和2010~2017年土地利用变化规律一致,林地和城镇用地面积不断增加,其余类型则呈现减少的趋势;(2)SWAT模型在抚河流域径流模拟中适用性好,李家渡水文站率定期和验证期结果R2和ENS均大于0.85,沙子岭水文站除了验证期ENS为0.77外,R2和ENS均大于0.80,两处站点相对误差|Re|均小于20%;(3)在气象数据同为2010~2016年及其他阈值设置相同的条件下,仅改变输入的土地利用图,发现林地面积的增加,耕地和草地面积的减小导致了2010年比2003年的多年平均月径流量降低0.65 m3/s,2017年的多年平均月径流量较2010年相比降低0.41 m3/s,后段时期的差异与前者相比较小与林地的增长减缓和城镇用地快速增长有关;(4)在第一阶段2003~2010年和第二阶段2010~2017年,流域内大部分地区径流系数都处于降低状态,林地和草地面积的增加对径流系数有降低的效果,而径流系数升高一般是因为耕地、城镇用地面积增加或者林地面积减少导致的。

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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