论文部分内容阅读
基于参照干湿限的遥感蒸散发模型(REDRAW)反演了黄河中游河龙区间5个典型子流域2000—2010年的蒸散发,结合归一化植被指数(NDVI)分析了区域蒸散发的年内和年际特征。年尺度流域水量闭合验证结果表明,REDRAW模型反演的区域年蒸散发多年平均为358.3 mm,接近降雨径流之差351.4 mm,平均相对误差2.6%,年尺度ET反演结果较为合理,说明REDRAW在研究区域具有一定的适用性。区域蒸散发与NDVI年内变化较为一致,年际变化存在一定正相关,11年间增长趋势较为明显。区域NDVI的显著增加与植树造林等水保措施有关,结合流域的降雨径流等水文数据分析可知,植被覆盖的增加一方面增加蒸散发耗散,另一方面通过截留等作用促使径流减少。
Based on the REDRAW model, the evapotranspiration of five typical sub-basins in the middle reaches of the Yellow River from 2000 to 2010 was analyzed. Based on the normalized NDVI, the annual evapotranspiration And interannual characteristics. The results of annual water closure in the annual catchment show that the average annual evapotranspiration of the REDRAW model is 358.3 mm, which is close to 351.4 mm of the rainfall runoff with an average relative error of 2.6%. The ET inversion at the annual scale is reasonable, indicating that REDRAW The study area has some applicability. Regional evapotranspiration and NDVI are more consistent during the year, and there is a positive correlation between interannual variations. The trend of 11-year growth is obvious. The significant increase of NDVI is related to soil and water conservation measures such as afforestation. Combined with hydrological data analysis of rainfall and runoff, the increase of vegetation cover increases evapotranspiration and dissipation and, on the other hand, reduces runoff by interception.