Estimating Ground Water Recharge using Flow Models of Perched Karstic Aquifers.

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Estimating Ground Water Recharge using Flow Models of Perched Karstic Aquifers. Abstract Text:

Menachem Weiss,Haim Gvirtzman,Menachem Weiss,Haim Gvirtzman,Menachem Weiss,Haim Gvirtzman,

The fraction of rain that is annually recharged to ground water is a function of the transient quantities of precipitation (wet vs. dry years) as well as other meteorological and geologic factors, and thus it is very difficult to estimate. In this study, we have used long records (20 to 30 years) of precipitation and spring discharge to reconstruct the transient character of yearly recharge. These data sets were used to calibrate numerical ground water flow models on the less than 3 km(2) scale for four separate perched karstic aquifers in the Judean and Samarian Mountains of Israel. The stratification and karstic character of the local carbonate rock aquifers cause ground water to flow through discrete dissolution channels and to discharge at isolated springs. An innovative, dual-porosity approach was used where a finite-difference solution simulates flow in the rock matrix, while the karstic channels are simulated using computationally simple drains. Perched conditions are also simulated innovatively using MODFLOW by treating the bottom unsaturated layer as if it is saturated, but by assuming zero pressure head throughout the "unsaturated" layer. Best fitting between measured and computed spring hydrograph data has allowed us to develop a set of empirical functions relating measured precipitation to recharge to the aquifer. The generic methodology presented gives insight into the suspected changes in aquifer recharge rates between particularly wet or dry years.

Estimating Ground Water Recharge using Flow Models of Perched Karstic Aquifers. Publishing Authors By Initials

M Weiss,H Gvirtzman,M Weiss,H Gvirtzman,M Weiss,H Gvirtzman,

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Estimating Ground Water Recharge using Flow Models of Perched Karstic Aquifers. Journal Published:

PUBLICATION TYPE: Journal Article

Journal: Ground water

VOLUME: 45

Page Numbers: 761-73

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ISSN: 0017-467X

DAY: 1

MONTH: 11

YEAR: 2007

Estimating Ground Water Recharge using Flow Models of Perched Karstic Aquifers. Information

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LANGUAGE: eng

NlmUniqueID: 9882886

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Grant and Affiliation Information for Estimating Ground Water Recharge using Flow Models of Perched Karstic Aquifers.

AFFILIATION: Institute of Earth Sciences, Hebrew University of Jerusalem, Givat Ram, Jerusalem 91904, Israel.

Country: United States

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MEDLINETA: Ground Water

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