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首页> 外文期刊>Open Journal of Modern Hydrology >Application of MODIS-Based Monthly Evapotranspiration Rates in Runoff Modeling: A Case Study in Nebraska,USA
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Application of MODIS-Based Monthly Evapotranspiration Rates in Runoff Modeling: A Case Study in Nebraska,USA

机译：基于MODIS的月蒸散率在径流模拟中的应用：以美国内布拉斯加州为例

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摘要

Daily and monthly flow-rates of the Little Nemaha River in Nebraska were simulated by the lumped-parameter Jakeman-Hornberger as well as a distributed-parameter water-balance accounting procedure for the 2003-2008 and 2000-2009 periods, respectively, with and without the help of the MODIS-based monthly estimates of evapotranspiration (ET) rates. While the daily lumped-parameter model simulation accuracy remained practically unchanged with the inclusion of the monthly MODIS-based ET rates interpolated into daily values (R2 of 0.66 vs 0.68, simulated to measured runoff ratio remaining the same 96%), the monthly water-balance accounting model outcomes did improve to some extent (from an R2 of 0.67 to 0.7 with simulated to measured runoff ratio of 72% vs 115%). In both cases the models had to be slightly modified for accommodation of the ET rates as predefined input values, not present in the original model setups. These results indicate the potential practical usefulness of satellite-derived ET estimates (CREMAP values in the present case) in monthly water-balance modeling. CREMAP is a calibration-free ET estimation method based on MODIS-derived daytime surface temperature values in combination of basic climatic variables, such as air temperature, humidity and solar radiation within a Complementary Relationship framework of evaporation.
机译：内布拉斯加州小纳马哈河的日流量和月流量分别由集总参数Jakeman-Hornberger以及2003-2008年和2000-2009年的分布式参数水平衡核算程序模拟，分别为无需基于MODIS的蒸散量（ET）每月估算值。尽管每日集总参数模型的模拟精度几乎保持不变，但将基于MODIS的每月ET率内插到每日值中（R2为0.66 vs 0.68，模拟至测得的径流比保持相同的96％），每月水平衡核算模型的结果确实有所改善（从R2的0.67到0.7，模拟到实测的径流比率分别为72％和115％）。在这两种情况下，都必须对模型进行些微修改，以适应ET率作为预定义的输入值，而原始模型设置中不存在。这些结果表明，在月度水量平衡模型中，卫星衍生的ET估算值（在当前情况下为CREMAP值）具有潜在的实用性。 CREMAP是一种基于MODIS的白天表面温度值，结合基本气候变量（例如，蒸发的互补关系框架内的气温，湿度和太阳辐射）的无标定ET估算方法。

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