基于SWAT模型的金华江上游土地利用变化对径流影响的研究

流域内土地利用变化对水文循环有着重要影响.本文通过在金华江上游建立SWAT模型,模拟了不同土地利用情景下流域径流的变化特点,结果表明:SWAT模型模拟精度高,其中验证期Ens=0.85,R2=0.85,Re=0.07,可以模拟及分析流域水文对土地利用变化的响应;在该流域内,林地有减少径流量的作用而草地和耕地相反;保护耕地使流域内农业产量增加但也使径流量增加,且增加量集中在雨季.

Research on the influence of land utilization change in upstream area of Jinhua River on runoff based on SWAT model

Land utilization change in the river basin has important influence on hydrological cycle.In the paper, a SWAT model is established in upstream area of Jinhua River.Results show that SWAT model has high simulation precision, wherein Ens=0.85, R2=0.85 and Re=0.07 during validation period.The respouse of river basin hydrology on land utilization change can be simulated and analyzed.Forest has the function of reducing runoff, whereas grassland and arable land has reverse effects in the river basin.Arable land can be protected for increasing agricultural yield within the river basin.However, the runoff is also increased, especially in rainy season.