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Modelling Catchment Hydrology Within a Gis Based Svat-model Framework : Volume 4, Issue 2 (30/11/-0001)

By Ludwig, R.

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Book Id: WPLBN0003984421
Format Type: PDF Article :
File Size: Pages 11
Reproduction Date: 2015

Title: Modelling Catchment Hydrology Within a Gis Based Svat-model Framework : Volume 4, Issue 2 (30/11/-0001)  
Author: Ludwig, R.
Volume: Vol. 4, Issue 2
Language: English
Subject: Science, Hydrology, Earth
Collections: Periodicals: Journal and Magazine Collection, Copernicus GmbH
Historic
Publication Date:
-0001
Publisher: Copernicus Gmbh, Göttingen, Germany
Member Page: Copernicus Publications

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Mauser, W., & Ludwig, R. (-0001). Modelling Catchment Hydrology Within a Gis Based Svat-model Framework : Volume 4, Issue 2 (30/11/-0001). Retrieved from http://hawaiilibrary.net/


Description
Description: Institute of Geography, University of Munich, Department of Geography and Geographical Remote Sensing, Luisenstrasse 37, 80333 Munich, Germany. The physically-based soil-vegetation-atmosphere-transfer model PROMET (PRocess-Oriented Model for Evapo Transpiration) developed at the Institute of Geography, University of Munich, is applied to the Ammer basin (approx. 600 km2 ) in the alpine foreland of Germany. The hourly actual evapotranspiration rate is calculated for a 14-year time series. A rainfall-runoff model, based on an enhanced distributed TOPMODEL structure, is linked to the SVAT-model in order to provide a hydrological model covering the water-cycle at the basin scale in a 30m-resolution. The model is driven with meteorological data taken from regular synoptic stations of the German Weather Service. Soil physical and plant physiological parameters for the SVAT model were either measured at the test site or taken from literature. The topographical parameters were derived from detailed digital terrain analysis. The study intends to combine, within a GIS-based model framework, the understanding and application of physical processes inherent in the basin such as the spatial distribution and temporal evolution of evapotranspiration and runoff patterns. The influence of an evapotranspiration coefficient ETcoeff, implemented in the formulation of the soil-topographic-index, to account for seasonal dynamics in distributed runoff formation due to the annual course of vegetation activity is investigated. The SVAT model shows convincing results in the long-term water balance description with a mean annual deviation of less then 6% over a fourteen year time period. Introducing the evapotranspiration-soil-topographic-index αET leads to a considerable improvement; the runoff model component simulating the daily runoff over the year reaches an efficiency of ε = 0.92.

Keywords: Water cycle; Geographic Information System; SVAT; TOPMODEL



Summary
Modelling catchment hydrology within a GIS based SVAT-model framework

 

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