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Can basin-scale recharge be estimated reasonably with water-balance models?

Vadose Zone Journal

By:
, , , , and
DOI: 10.2136/vzj2005.0109

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Abstract

We examine in-place recharge as an example of the complex, basin-scale hydrologic processes that are being represented with simplified numerical models. The rate and distribution of recharge depend on local meteorological conditions and hydrogeologic properties. The pattern of recharge is defined predominantly by the distribution of net precipitation (precipitation less evapotranspiration), but different pedotransfer functions (PTFs) predict different fractions of precipitation that become in-place recharge at a given location. At any single location, these differences can often be explained on the basis of the PTF characteristics, but because of the complex averaging that occurs across a basin, the combined effects of meteorological variation and soil textural variation on the basin-wide recharge rates cannot be predicted on the basis of the characteristics of different PTFs. In fact, we show that the same basin-scale numerical model, using identical inputs and modeling options, can produce almost an order of magnitude variation in predicted basin total recharge depending on the choice of PTF. This suggests that sensitivity analyses should be performed on the choice of constitutive relationship (e.g., PTF) when assessing the predictive capability of basin-scale hydrologic models. ?? Soil Science Society of America.

Additional Publication Details

Publication type:
Article
Publication Subtype:
Journal Article
Title:
Can basin-scale recharge be estimated reasonably with water-balance models?
Series title:
Vadose Zone Journal
DOI:
10.2136/vzj2005.0109
Volume
5
Issue:
3
Year Published:
2006
Language:
English
Larger Work Type:
Article
Larger Work Subtype:
Journal Article
Larger Work Title:
Vadose Zone Journal
First page:
850
Last page:
855