Annual Estimates of Recharge, Quick-Flow Runoff, and Evapotranspiration for the Contiguous US Using Empirical Regression Equations
Annual Estimates of Recharge, Quick-Flow Runoff, and Evapotranspiration for the Contiguous US Using Empirical Regression Equations
复制标题
DOI：
10.1111/1752-1688.12546
复制
发表时间：
2017-08-01
影响因子：
2.4
通讯作者：
Cazenas, J.
中科院分区：
文献类型：
--
作者：
Reitz, M.;Sanford, W. E.;Cazenas, J.
这项研究提出了新的数据驱动，每年的降水量的划分为补给，快速径流，蒸散（ET）水预算组件为2000-2013年的美国（CONUS）的估计。用于生成这些地图的算法确保了在这一广阔的空间尺度上水收支的一致性，降水量的贡献归因于800米分辨率的每个组件。快速径流估计的贡献迅速变化的部分的水文线使用的数据从1,434计流域，并取决于降水量，土壤饱和导水率，和地表地质类型。蒸散量的估计产生的回归使用水平衡数据从679 gaged流域，并依赖于土地覆盖，温度和降水。结合快流和ET估计来计算降水剩余部分的补给。ET和补给估计检查独立的现场数据，结果显示出良好的一致性。对补给量估计与地下水开采数据的比较表明，在该国15%的地区，地下水的开采速度高于当地补给量。这些地图的内部一致的水收支组成部分的补给，径流和ET，来自数据和测试，预计将提供可靠的一阶估计这些数量在美国本土，即使现场测量稀疏。
This study presents new data-driven, annual estimates of the division of precipitation into the recharge, quick-flow runoff, and evapotranspiration (ET) water budget components for 2000-2013 for the contiguous United States (CONUS). The algorithms used to produce these maps ensure water budget consistency over this broad spatial scale, with contributions from precipitation influx attributed to each component at 800m resolution. The quick-flow runoff estimates for the contribution to the rapidly varying portion of the hydrograph are produced using data from 1,434 gaged watersheds, and depend on precipitation, soil saturated hydraulic conductivity, and surficial geology type. Evapotranspiration estimates are produced from a regression using water balance data from 679 gaged watersheds and depend on land cover, temperature, and precipitation. The quick-flow and ET estimates are combined to calculate recharge as the remainder of precipitation. The ET and recharge estimates are checked against independent field data, and the results show good agreement. Comparisons of recharge estimates with groundwater extraction data show that in 15% of the country, groundwater is being extracted at rates higher than the local recharge. These maps of the internally consistent water budget components of recharge, quick-flow runoff, and ET, being derived from and tested against data, are expected to provide reliable first-order estimates of these quantities across the CONUS, even where field measurements are sparse.