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Wageningen Universiteit (1991)

Salinity management in river basins : modelling and management of the salt-affected Jarreh Reservoir (Iran)

Shiati, K.

Titre : Salinity management in river basins : modelling and management of the salt-affected Jarreh Reservoir (Iran)

Auteur : Shiati, K.

Université de soutenance : Wageningen Universiteit

Grade : PhD thesis 1991

Résumé
The sources and origin of salts in the basin of the two salt- affected Shapur and Dalaki rivers (Southern Iran) and the processes involved in salinization have been studied. The extent of water deterioration have been identified by examining spatial changes in the rivers water quality. Among salinity management measures pertaining to water quality, the engineering measures are investigated. It appears that the construction and management of the planned Jarreh Reservoir on the Shapur River is the most feasible one.

The dynamic reservoir simulation model, - DYRESM (Imberger, et al., 1978, Version 6.4) is adapted to simulate the salinity/temperature distribution, long-term behaviour and response to various management policies in this reservoir. A simplified method to account for the effect of sediment particles on density of inflows and the inflowing processes in mild bed slope reservoirs is introduced. The method applies only to the steady motion of a turbidity current that is neither depositing nor eroding sediments. The vertical propagation of sediment has not been modelled. This applies to those substances (like dissolved salt) that are not reacting physically or (bio)chemically with suspended particles.

Various management options to minimize the salinity build-up in the reservoir are examined. Among these, the diversion of the most saline part of the summer flows to a point downstream of the last irrigation intakes will result in a significant water quality improvement. At the end of a 5-year simulation, only a weak salinity gradient remains in the reservoir. Based on simulations, using 15 years of data, and the salt balance calculation, the long-term behaviour of the Jarreh Reservoir is studied, It is shown that the salinity in the reservoir is largely determined by annual variabilty in the river discharge

Mots clés : rivers / streams / canals / water / surface water / water pollution / water quality / chemical properties / water management / soil / sodium / improvement / salinization / models / research / waterways / salinity / watersheds / drainage / iran

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