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International Institute for Geo-information Science and Earth Observation (2009)

An Integrated Spatial Decision Support System on a distributed hydrological model for IWRM in the semi-arid Nambiyar river basin in India

Selvaraj Antony Anbarasu

Titre : An Integrated Spatial Decision Support System on a distributed hydrological model for IWRM in the semi-arid Nambiyar river basin in India.

Auteur : Selvaraj Antony Anbarasu

Organisme de soutenance : International Institute for Geo-information Science and Earth Observation

Grade : Master of Science in Geo-information 2009

Résumé
Water management in the semiarid basins of the developing countries has its unique character. Limited water resources on one hand and on the other hand, often inefficient water management supported with very limited tools and skills. Dry spells in these basins are full of problems associated with water assessment, allocation, policy implementation and societal conflicts. This research focuses on the holistic management of a water scarce basin, covering surface water, groundwater and the water management tools. The surface water resources are assessed at local scale though not dynamic. The dynamic local scale assessment of the groundwater is the core technological problem the basins are facing. A few sets of spread sheet calculations with no regard for the hydrogeological boundaries of the basin is still being followed. The scarce groundwater resource in these semiarid basins gives raise to societal conflicts between the irrigation, industrial and domestic consumption sectors. The basin administrators are often unable to implement their good policies on water sharing for want of a scientific mechanism. This research is aimed at evolving a framework for groundwater allocation in the basin through a scientifically sound and socially acceptable method. It found the solution in an Integrated Spatial Decision Support System (ISDSS) for the research basin of Nambiyar river in the Tamilnadu state of India. It has a technological engine in its distributed, surface water and groundwater coupled fully transient numerical hydrological model. The social front is in the Collaborative Multi Criteria Decision Making (CMCDM) where all the stakeholders are involved. They consider all the criteria concerning the water utility in the basin and allocate water among themselves as simulated by the hydrological model. The MIKE SHE code, which covers the entire land phase of the water cycle, is used in the hydrological model. The results of the model qualitatively focus on the output values and it needs further calibration with field test data. The research is a combination of technology put into solving societal conflicts in the water sharing in dry basins.

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Page publiée le 29 novembre 2013, mise à jour le 18 octobre 2018