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Recharge Estimation and Soil Moisture Dynamics in a Mediterranean, Semi-arid Karst Region : Volume 19, Issue 3 (20/03/2015)

By Ries, F.

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Book Id: WPLBN0004011399
Format Type: PDF Article :
File Size: Pages 18
Reproduction Date: 2015

Title: Recharge Estimation and Soil Moisture Dynamics in a Mediterranean, Semi-arid Karst Region : Volume 19, Issue 3 (20/03/2015)  
Author: Ries, F.
Volume: Vol. 19, Issue 3
Language: English
Subject: Science, Hydrology, Earth
Collections: Periodicals: Journal and Magazine Collection, Copernicus GmbH
Historic
Publication Date:
2015
Publisher: Copernicus Gmbh, Göttingen, Germany
Member Page: Copernicus Publications

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Schmidt, S., Lange, J., Puhlmann, H., Ries, F., & Sauter, M. (2015). Recharge Estimation and Soil Moisture Dynamics in a Mediterranean, Semi-arid Karst Region : Volume 19, Issue 3 (20/03/2015). Retrieved from http://hawaiilibrary.net/


Description
Description: Chair of Hydrology, University of Freiburg, Freiburg, Germany. Knowledge of soil moisture dynamics in the unsaturated soil zone provides valuable information on the temporal and spatial variability of groundwater recharge. This is especially true for the Mediterranean region, where a substantial fraction of long-term groundwater recharge is expected to occur during high magnitude precipitation events of above-average wet winters. To elucidate process understanding of infiltration processes during these extreme events, a monitoring network of precipitation gauges, meteorological stations, and soil moisture plots was installed in an area with a steep climatic gradient in the Jordan Valley region. In three soil moisture plots, Hydrus-1D was used to simulate water movement in the unsaturated soil zone with soil hydraulic parameters estimated by the Shuffled Complex Evolution Metropolis algorithm. To generalize our results, we modified soil depth and rainfall input to simulate the effect of the pronounced climatic gradient and soil depth variability on percolation fluxes and applied the calibrated model to a time series with 62 years of meteorological data.

Soil moisture measurements showed a pronounced seasonality and suggested rapid infiltration during heavy rainstorms. Hydrus-1D successfully simulated short and long-term soil moisture patterns, with the majority of simulated deep percolation occurring during a few intensive rainfall events. Temperature drops in a nearby groundwater well were observed synchronously with simulated percolation pulses, indicating rapid groundwater recharge mechanisms. The 62-year model run yielded annual percolation fluxes of up to 66% of precipitation depths during wet years and of 0% during dry years. Furthermore, a dependence of recharge on the temporal rainfall distribution could be shown. Strong correlations between depth of recharge and soil depth were also observed.


Summary
Recharge estimation and soil moisture dynamics in a Mediterranean, semi-arid karst region

Excerpt
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