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TRMM遥感降水数据在伊洛瓦底江流域的精度检验和校正方法研究

DOI: 10.11867/j.issn.1001-8166.2014.11.1262, PP. 1262-1270

Keywords: 缺资料流域,水文模拟,地形校正,精度评价

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Abstract:

在伊洛瓦底江流域利用13个雨量站数据对TRMM日降水数据进行了精度检验,提出了一种基于水量平衡的TRMM数据校正方法。该方法首先以SWAT模型为基础,以不同子流域内的水量平衡为目标,计算各个子流域的TRMM数据校正系数;其次以子流域内的坡度值为自变量,校正系数为因变量,对二者进行回归分析,在没有水文控制站的子流域根据坡度求得对应的校正系数,对各个子流域的降水数据分别进行校正。结果显示,校正前TRMM年降水量和月降水量与实测值有较高相关性,但偏差较大;校正后年降水量与实测值基本一致;月降水量与实测曲线吻合较好;日降水量的预报等级从中等提高到了良好,校正前2个站预报等级差,7个良好,4个中等,校正后6个良好,2个中等,5个优秀。结果表明此方法在伊江流域能在不同时间尺度上显著提高TRMM数据的精度,为流域水文水资源分析提供数据支持。

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