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引用本文:杨宏伟,许崇育.东江流域典型子流域土地利用/覆被变化对地表径流影响.湖泊科学,2011,23(6):991-996. DOI:10.18307/2011.0624
YANG Hongwei,XU Chongyu.Effect of LUCC on runoff of three representative watersheds in Dongjiang River Basin. J. Lake Sci.2011,23(6):991-996. DOI:10.18307/2011.0624
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东江流域典型子流域土地利用/覆被变化对地表径流影响
杨宏伟1,2, 许崇育1
1.南京大学地理与海洋科学学院, 南京 210093;2.中国科学院南京地理与湖泊研究所, 南京 210008
摘要:
应用SWAT模型对东江上中下游典型流域的地表径流进行模拟, 采用1977-1981年和1996-2000年胜前、顺天和九州三个出口控制站逐月实测径流资料进行模型校准和验证, 确定模型的敏感性参数, 采用相关系数R2和Nash-Suttclife模型效率系数ENS, 对SWAT模型模拟结果进行评价, 结果显示模拟精度较高, R2>0.85, ENS在0.68-0.75之间.在此基础上进一步探讨了典型流域土地利用变化对地表径流的影响, 研究认为林地面积的增加可导致年径流量减少;年内分配上枯水期径流明显增加, 丰水期径流明显减少;小于15°的林地面积增加引起的径流减少作用更为明显。
关键词:  SWAT模型  土地利用/覆被变化  地表径流  东江典型流域
DOI:10.18307/2011.0624
分类号:
基金项目:香港特别行政区研究基金会项目(CUHK4627/05H)资助
Effect of LUCC on runoff of three representative watersheds in Dongjiang River Basin
YANG Hongwei1,2, XU Chongyu1
1.School of Geographic and Oceanographic Sciences, Nanjing University, Nanjing 210093, P.R.China;2.Nanjing Institute of Geography and Limnology, Chinese Academy of Sciences, Nanjing 210008, P.R.China
Abstract:
With the hydrological model SWAT, the runoff variation of three representative watersheds in Dongjiang River Basin was simulated.With discharge data from Shengqian, Shuntian and Jiuzhou hydrological stations in 1977-1981 and 1996-2000, more sensitive hydrology factors were calibrated and satisfactory simulation results were obtained (R2>0.85, 0.68 <ENS <0.75).The study investigated the influences of LUCC on the hydrological process of the three watersheds.The result shows that:(1) the in-crease of forest area was the cause of annual runoff decrease;(2) in terms of annual variability, runoff decrease in the wet season while increase in the dry season;(3) the decrease of runoff becomes more notable when the forest area increases with slope <15°.
Key words:  SWAT  LUCC  runoff  representative watersheds in Dongjiang River Basin
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