Agenda de l'ENS de Lyon

Developing video monitoring technique in riverine environment: automatic and continues detection.

ven 11 déc 2020


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M. Zhi ZHANG du laboratoire EVS, sous la direction de M. Hervé PIEGAY

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Description générale

Drift wood play a significant role both on the ecology and morphology of a river. Therefore, quantifying the amount of wood in rivers is an important issue. During recent years, streamside video monitoring has been introduced as a feasible technique to evaluate the amount of wood in riverine environment. Beside many advances, there are still many questions needed to be adress concerning this technique. Therefore, in this study, I focused on three major objectives. Firstly, I studied the relation between wood flux and flow discharge in order to create a model for predicting wood flux on invisible period of camera sight. Wood in-stream can show some different characteristics in some critical events, such as in two multi-peak floods, wood flux on the first peak of discharge is more than second one, and in a flood after a stronger windy day, wood flux can be activated by water elevation arise. In addition, the second major objective was implementation and validation the application of an automatic detection software. After training the software, it is used to extract wood flux automatically by its own surveillance. The third major objective was evaluating human-based uncertainties in video monitoring due to two limitations, first time limitation which results in bias between different operators. I expect the results of this thesis develop the application of streamside video monitoring technique for practical concerns.


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