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Accueil du site → Doctorat → Afrique du Sud → 2001 → The development and evaluation of an operating rule framework for the ACRU agrohydrological modelling system.

University of KwaZulu-Natal (2001)

The development and evaluation of an operating rule framework for the ACRU agrohydrological modelling system.

Butler, Andrew John Edward.

Titre : The development and evaluation of an operating rule framework for the ACRU agrohydrological modelling system.

Auteur : Butler, Andrew John Edward.

Université de soutenance : University of KwaZulu-Natal

Grade : MSc in Engineering 2001

Résumé partiel
Dams hold numerous benefits for society through their ability to store water on a long-term basis. However, it is well-known that there is a detrimental effect of dams on the rivers that they impound, and this has been taken into account by the South African National Water Act (1998). The Act specifies a two component Reserve to provide a basic water supply to humans and to provide protection to downstream rivers and their associated ecosystems. From an ecological perspective, emphasis is now placed on ensuring that flow in rivers is maintained in a state that closely mimics the natural flow regime in order to sustain the water resource and its associated aquatic ecosystems. The resulting challenge for water resources modelling is to develop operating rule frameworks that can account for water supply to multiple users, including the "environment" which represents downstream aquatic ecosystems. These frameworks need to consider both water stored in dams, as well as water in the river which has been allocated to different water uscrs. Such an operating rule framework has been implemented ID the daily time-step ACRU agrohydrological model in order to : (a) satisfy the requirements of water users in general, (b) (c) include the environment as a user of water, and thus attempt to satisfy the water requirements of rivers and their associated ecosystems by making artificial releases from dams using both a simple and a complicated approach for determining the environmental requirements. The framework identifies four types of water users, each of which are capable of requesting water from a water source. These users are : a domestic user, representing the basic human needs component of the Reserve, an environmental user, representing the ecological component of the Reserve, an industrial user and an irrigator.

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