Poster (Scientific congresses and symposiums)
How to measure connectivity?
Cantreul, Vincent; Pineux, Nathalie; Swerts, Gilles et al.
2015réunion Cost Connectuer Action Durham
 

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Keywords :
catchment; mitigation measures; infrared camera; connectivity; modelling; UAV; scale; erosion; runoff
Abstract :
[en] Erosion is a major threat to European soil. Consequences can be very important both on-site and off-site. Belgian loamy soils are highly vulnerable to this threat because of their natural sensitivity to erosion on the one hand, and because the land is mainly used for intensive agricultural practices on the other hand. Over the last few decades, rising erosion has even been observed in our regions. This shows the importance of a deeper understanding of the coupled phenomena of runoff and erosion in order to manage soils at catchment scale. Plenty of research have already studied this but all agree to say that it seems to have a non-linear relationship between rainfall and discharge, as well as between rainfall and erosion. For that reason, a new concept has been developed a few years ago: the hydrological connectivity. Several research have focused on connectivity but up to now, each there are as much definition as papers. In this thesis, it will be important firstly to resume all these definitions to clarify this concept. Secondly, a methodology using various transects on the watershed and some pertinent field measurements will be used. These measurements include spatial distribution of particle size, surface states and perhaps soil moisture. A new approach of photogrammetry using an UAV will be used to observe erosion and deposition zones on the watershed. In addition to that, infrared camera will be installed on different positions in the catchment. This permits to detect when and where variably saturated areas are active and so when connectivity is active between hillslopes and stream. In this framework, several time scales will be studied from the event scale to the annual scale passing by monthly and seasonal scales. All this will serve to progress toward a better understanding of the concept of hydrological connectivity in order to study erosion at catchment scale. The final goal of this study is to describe hydrologically each different part of the catchment and to generalize these behaviors to other catchments with similar properties if possible. Afterwards, this research will be integrated in an existing (or not) model to improve the modelling of discharge and erosion in the catchment. Thanks to that, a scenario of hydraulic mitigation measures could be proposed in order to reduce runoff and erosion in the catchment. This scenario will include hydraulic, hydrologic but also ecological, landscape and economical points of view.
Disciplines :
Earth sciences & physical geography
Author, co-author :
Cantreul, Vincent ;  Université de Liège - ULiège > Ingénierie des biosystèmes (Biose) > Echanges Eau-Sol-Plantes
Pineux, Nathalie ;  Université de Liège - ULiège > Ingénierie des biosystèmes (Biose) > Echanges Eau-Sol-Plantes
Swerts, Gilles ;  Université de Liège - ULiège > Ingénierie des biosystèmes (Biose) > Echanges Eau-Sol-Plantes
Degré, Aurore  ;  Université de Liège - ULiège > Ingénierie des biosystèmes (Biose) > Echanges Eau-Sol-Plantes
Language :
English
Title :
How to measure connectivity?
Publication date :
September 2015
Event name :
réunion Cost Connectuer Action Durham
Event date :
14 septembre au 16 septembre 2015
Available on ORBi :
since 27 November 2017

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