GlobWat - a global water balance model to assess water use in irrigated agriculture
GlobWat - a global water balance model to assess water use in irrigated agriculture
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DOI：
10.5194/hess-19-3829-2015
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发表时间：
2015-01-01
影响因子：
6.3
通讯作者：
van de Giesen, N.
中科院分区：
文献类型：
--
作者：
Hoogeveen, J.;Faures, J. -M.;van de Giesen, N.
GlobWat是一个免费分发的全球土壤水平衡模型，由粮食及农业组织（粮农组织）用于评估灌溉农业的用水情况，这是越来越多地区淡水短缺的主要因素。该模型基于空间分布的高分辨率数据集，这些数据集在全球一级是一致的，并根据粮农组织全球水和农业信息系统AQUASTAT公布的内部可再生水资源值进行了校准。水平衡的计算分两步进行：首先计算“垂直”水平衡，包括原位降雨（“绿色”水）的蒸发和灌溉作物的增量蒸发。在第二阶段，计算“水平”水平衡，以确定河流（子）流域的排放量，同时考虑到灌溉、开放水域和湿地（“蓝”水）的蒸发增量。本文介绍了该模型的方法，输入和输出数据，校准和验证。最后将模型结果与其他全球水平衡模型进行比较，以评估其准确性和有效性。
GlobWat is a freely distributed, global soil water balance model that is used by the Food and Agriculture Organization (FAO) to assess water use in irrigated agriculture, the main factor behind scarcity of freshwater in an increasing number of regions. The model is based on spatially distributed high-resolution data sets that are consistent at global level and calibrated against values for internal renewable water resources, as published in AQUASTAT, the FAO's global information system on water and agriculture. Validation of the model is done against mean annual river basin outflows.The water balance is calculated in two steps: first a "vertical" water balance is calculated that includes evaporation from in situ rainfall ("green" water) and incremental evaporation from irrigated crops. In a second stage, a "horizontal" water balance is calculated to determine discharges from river (sub-) basins, taking into account incremental evaporation from irrigation, open water and wetlands ("blue" water). The paper describes the methodology, input and output data, calibration and validation of the model. The model results are finally compared with other global water balance models to assess levels of accuracy and validity.