Watershed groundwater balance estimation using streamflow recession analysis and baseflow separation
Watershed groundwater balance estimation using streamflow recession analysis and baseflow separation
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DOI：
10.1016/s0022-1694(99)00040-2
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发表时间：
1999-06
影响因子：
6.4
通讯作者：
H. Wittenberg;M. Sivapalan
中科院分区：
文献类型：
--
作者：
H. Wittenberg;M. Sivapalan
通过分析观测到的集水区径流时间序列，可以确定和量化地下水平衡的主要组成部分，即排放、蒸散损失、储存和补给。这种整体（而不是还原）的估计方法证明了哈里斯河流域西南西澳大利亚州。通过对大量径流退水曲线的分析，发现浅层潜水的地下水流量与水库蓄水量之间呈非线性关系。然而，通过树木根系的吸水，蒸发蒸腾损失导致的地下水枯竭会使衰退曲线和估计的水库参数产生偏差。由于降雨量和潜在蒸发的季节性，衰退曲线的分析，分层根据一年中的时间，允许作为一个函数的日历月和存储的地下水存储的蒸散量损失的量化。补给地下水含水层的时间序列计算从观测到的总径流量，估计的排放量和蒸散损失，逆非线性水库路由。采用传统的单位线法，通过最小二乘拟合计算单位补给量对降雨的响应。估计的单位响应函数的形状没有表现出显着的季节变化。
By the analysis of the observed time series of streamflow from catchments, the main components of the underlying groundwater balance, namely, discharge, evapotranspiration loss, storage and recharge, can be identified and quantified. This holistic (as opposed to reductionist) estimation method is demonstrated for the Harris River catchment in southwest Western Australia. The relationship between the groundwater discharge and the reservoir storage of shallow unconfined aquifers was found to be nonlinear based on the analysis of numerous streamflow recession curves. However, depletion of groundwater by evapotranspiration losses, through the water uptake of tree roots, was found to bias the recession curves and the estimated reservoir parameters. As a result of the seasonality of both rainfall and potential evaporation, analysis of the recession curves, stratified according to time of the year, allowed the quantification of evapotranspiration loss as a function of calendar month and stored groundwater storage. Time series of recharge to the groundwater aquifer were computed from the observed total streamflows, and the estimated discharge and evapotranspiration losses, by inverse nonlinear reservoir routing. Using traditional unit hydrograph methods unit recharge responses to rainfall were computed by least squares fitting. The shapes of the estimated unit response functions showed no significant seasonal variation.