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Surface and groundwater modelling to help water management of anthropogenic hydrosystem

Fabien Christin
Abstract : Increasingly important pressures on water resources impose new constraints on managers of anthropogenic hydrosystems, such as the constraints placed on rivers that are fed by dams. To help these managers to make decisions, they require mathematical models that help to predict evolutions (e.g. stream flows, piezometric levels) or to quantify some aspects that are difficult to measure (e.g. hydraulic conductivity). Consequently, the objective of this study is to identify the main characteristics of model to help quantitative management of water resources in anthropogenic hydrosystem, using the Charente basin as an example. Before moving to the management of this hydrosystem, a systemic analysis with correlation and spectral analysis needed to be performed to explore processes and interactions between different hydrosystem components, such as surface water and groundwater. These steps permitted a global comprehension of the hydrosystem's hydrodynamics (i.e. inputs, disruption and decisions variables) and present management. Moreover, investigations were performed on adapted modelling types, space and time steps for each component. Considering the poor results of an existing forecasting model in the Charente, a new type of modelling has been considered (black box models) and several configurations have been tested. The model using precipitation and piezometric levels as inputs and stream flows as outputs had the best results in the validation phase, with a Nash criterion of 0.7 for a forecasting horizon of 7 days. Furthermore, to install a more integrated management approach leading to a better distribution of water and economics resources, a socio-economic approach was investigated. With irrigators' behavioural information (withdrawals), a better allocation of dam water releases allowed the reconciliation of water resources supply and water demands in order to prevent several situations of water use restrictions and dangers for aquatic life. From this research, important elements have been identified to model hydrosystems in order to help their integrated management. As these findings were based on a single case example, they now require application in others situations to confirm their pertinence.
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https://pastel.archives-ouvertes.fr/pastel-00004967
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Submitted on : Tuesday, July 21, 2009 - 8:00:00 AM
Last modification on : Friday, October 23, 2020 - 4:33:28 PM
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Fabien Christin. Surface and groundwater modelling to help water management of anthropogenic hydrosystem. Sciences of the Universe [physics]. AgroParisTech, 2008. English. ⟨NNT : 2008AGPT0091⟩. ⟨pastel-00004967⟩

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