CAJ | 학술논문

运用美国农业部开发的分布式水文模型SWAT ，分析研究了清江宜都段在不同水文年、现状和2020年规划两种土地利用情景下的径流量和污染负荷。结果表明：①研究区域产水量由上游向下游递减，污染负荷产量的分布同产水量分布类似；②径流、总氮、总磷和降雨量有着直接的关系，随着降雨量的减少而减少；③在以退耕还林和城镇扩张为主要特点的2020年规划土地利用情景下，各乡镇所在子流域的产水量、有机氮、有机磷平均分别减少了2．5％、9．1％和20．3％；④对降雨和土地利用变化引起的流域水文变化进行对比，发现不论在年尺度还是月尺度下，降雨量变化对径流量、总磷、总氮的贡献率要比土地利用的变化大得多。
운용미국농업부개발적분포식수문모형SWAT ，분석연구료청강의도단재불동수문년、현상화2020년규화량충토지이용정경하적경류량화오염부하。결과표명：①연구구역산수량유상유향하유체감，오염부하산량적분포동산수량분포유사；②경류、총담、총린화강우량유착직접적관계，수착강우량적감소이감소；③재이퇴경환림화성진확장위주요특점적2020년규화토지이용정경하，각향진소재자류역적산수량、유궤담、유궤린평균분별감소료2．5％、9．1％화20．3％；④대강우화토지이용변화인기적류역수문변화진행대비，발현불론재년척도환시월척도하，강우량변화대경류량、총린、총담적공헌솔요비토지이용적변화대득다。
With the United States department of agriculture(USDA)development of the distributed hydrological model SWAT ,the pa‐per analyzed the runoff and pollution load in Yidu of the Qingjiang River Basin under different hydrologic years and the present and 2020 planning landuse scenarios .The results show that :①the water yield decreases from upstream to downstream ,and the distribu‐tion of pollution load is similar to the water yield .②Runoff、total nitrogen and total phosphorus have a direct relationship with rain‐fall and increase with it .③In the 2020 landuse planning scenario whose main characteristic are returning farmland to forest and urban expansion ,the average water yield、pollution load of each town decreased by 2 .5% 、9 .1% and 20 .3% .④ The changes which were caused by rainfall and landuse change were compared in this paper ,and we can find that the contribution of rainfall to runoff、total ni‐trogen and total phosphorus are far greater than the landuse change regardless on the scale of year or the moon .