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Accueil du site → Doctorat → Allemagne → 2010 → Hydrological snowmelt modelling in snow covered river basins be means of geographic information system and remote sensing case study - Latyan catchment in Iran

Friedrich-Schiller-Universität Jena (2010)

Hydrological snowmelt modelling in snow covered river basins be means of geographic information system and remote sensing case study - Latyan catchment in Iran

Behrawan, Houshang

Titre : Hydrological snowmelt modelling in snow covered river basins be means of geographic information system and remote sensing case study - Latyan catchment in Iran

Auteur : Behrawan, Houshang

Université de soutenance : Friedrich-Schiller-Universität Jena

Grade : Doctor Rerum Naturalium 2010

Résumé
In mountainous watersheds snow melt can have a significant impact on the water balance and at certain times of the year it could be the most important contribution to runoff. In many parts of the world snow act as natural reservoirs that can play an important role for water supply. Alas, despite its importance, many of snow driven basins suffer from a lack of hydrological infrastructure and equipment so they cannot be described adequately in terms of snow hydrological dynamics. Because of limited accessibility are the few observation stations in such areas very rarely located in the higher elevations but are concentrated mostly in the middle and low elevation resulting in an underrepresentation in data availability of the high altitudes which are important for the process dynamics. Thus the modelling of snow hydrological dynamics in mountainous regions such as the Latyan catchment is often difficult. Reasons for this are in addition to the aforementioned data availability, topographic effects and gradients that can make a spatial interpolation of the input data and the model states a complicated task. Especially in semi-arid regions, high-altitude headwater basins with a significant snow component have a large potential by balancing and distributing scarce water resources. Particular here, a quantitative assessment of the spatial distribution of snow cover and snow processes are an important basis for a sound water management and for the hydrological forecasting and risk prevention. Therefore, the water management in such regions could benefit from reliable predictions of the hydrological dynamics derived from model based studies. Suitable models should represent the physical basis and hydrological processes that simulate the system’s response, fairly well. In this study the spatially distributed process-oriented hydrological model J2000g was used for the 700 km² large Latyan catchment in Iran. The target was to derive spatially distributed estimates of the quantity and timing of hydrological balance terms and state variables like rainfall, actual evapotranspiration (AET), runoff, snow water equivalent (SWE) and snow melt. The model uses the distribution concept of Hydrological Response Units (HRU) to take the spatial variability in the basin into account.

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Page publiée le 1er novembre 2013, mise à jour le 11 mai 2019