Estimation of Minimum Ecological Water Level of GooriGol Wetland Using a Multi Objective Programming Model

Document Type : Research Article

Authors

1 Ph.D. student of applied Mathematics, Faculty of Mathematic Sciences, University of Tabriz, Tabriz, Iran

2 Tabriz University

3 Associate Professor, Faculty of Mathematic Sciences, University of Tabriz, Tabriz, Iran

Abstract

Estimation of the ecological level of water bodies is crucial to protect aquatic ecosystems and has become a major issue in sustainable water resources planning. In recent decades, several methods are utilized to estimate the minimum ecological flow in rivers and the minimum ecological level in lakes and wetlands. In this research, a multi-objective programming model is used to determine the ecological level of the GooriGol wetland. The proposed model has two objective functions with two indices of water and ecosystem indicators. The wetland water level has been selected as a water index and three species of important ducks of the wetland have been chosen as the ecosystem indices. The first objective function is to minimize the wetland water level, so that more water is provided to meet the needs of human societies, while the second objective function ensures the maximum ecosystem indices, so that more habitats are provided for aquatic ecosystems. Therefore, the aim of this model is to provide circumstances for the largest ecological services with the least amount of water. The used data in the multi-objective programming model are the storage water volume, wetland surface water area and water levels from 2003 to 2017 and the number of three important species of ducks from 2003 to 2017 as well. In order to solve this multi-objective optimization model, the sum of weighting technique is used and Benson method is used to verify the obtained results for situation in which white-head duck is chosen as the ecosystem indicator. The results indicated that the minimum ecological water level of GooriGol wetland is 1912.6 meter and the corresponding water storage volume of wetland is 503000 cubic meters. The field observations during the recent decade are in agreement with the obtained result of this research and indicates the decreasing the water level from 1912.6 m causes considerable declining in the ecological performance of the wetland.

Keywords

Main Subjects

References

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Amirkabir Journal of Civil Engineering
Volume 52, Issue 7
October 2020
Pages 1621-1636

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