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Theses

Naturalisation des débits

Abstract : The observed flow series include natural climatic variations and hydrological alterations due to human activities. Access to natural flows is necessary to optimise water resource management or for the regulatory control of uses. Naturalization methods enable to reconstitute "natural" flows from influenced measurements. In the studies, generally only a single naturalization method is applied, without justification of its choice, and that the naturalized flows are considered as an exact estimate of natural flow.The main objective of this thesis was to develop a method to assess the reliability of naturalization methods. The main difficulty is that, over the influenced period, it is not possible to directly compare the naturalized flows with the natural flow which cannot be observed. The approach adopted is based on a database of approximately 130 catchments in Australia, the United States and France. These catchments are mainly influenced by large dams. The size and diversity of the database in terms of climatic conditions and level of influence allowed us to obtain quite general results according to the characteristics of the basins.Results show that there are significant disparities in the flows obtained with the different naturalization methods. These differences can be explained by the fact that the naturalization methods are based on different assumptions and input data. The methodology proposed to assess the reliability of the methods in divided in two parts. The first part consists in assessing the assumptions of each of the naturalization methods and discarding those methods that do not validate the assumptions. The second part consists in evaluating the naturalization methods against a similar benchmark and assigning a confidence level to each of the methods. A combinatorial approach is then applied to produce naturalized flows.
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Submitted on : Tuesday, March 30, 2021 - 9:35:08 AM
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  • HAL Id : tel-03185026, version 1

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Morgane Terrier. Naturalisation des débits. Hydrologie. AgroParisTech, 2020. Français. ⟨NNT : 2020AGPT0006⟩. ⟨tel-03185026⟩

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