Skip to Main content Skip to Navigation
Theses

DYNAMIQUE EROSIVE ACTUELLE ET TRANSFERTS FLUVIATILES DANS L'OUEST DU BASSIN DE PARIS. Exemple de bassins versants littoraux en Haute Normandie : le Dun, la Ganzeville et l'Yères.

Abstract : Applied to small coastal river basins of the Western Paris Basin, the interest of this work is to present an integrated approach of the erosion dynamics at the scale of the river basin, from measurements of soil erodibility to high frequency monitoring of transfers in rivers. The objective is to quantify accurately river sediment yields, to identify factors controlling the erosion dynamics and to propose an estimation of continental sedimentary contributions to the English Channel. The obtained results underline that, despite of limonous soils highly erodible and high erosion rates measured from agricultural catchments, the rivers studied have some of the lowest values of sediment yield on a global scale (10, 1 t km-2 an-1 for the Yères River, 1, 3 t km-2 an-1 for the Dun River, 6, 6 t km-2 an-1 for the Ganzeville River). The comparison of these data with those of 214 rivers around the world (including the Somme and the Seine Rivers) confirms the influence of global factors controlling the erosion dynamics: basin area, low relief and moderate runoff. Regionally, this last factor is forced by a karstic hydrological functioning that is involved in the deficit balance of water discharges but also in the relief landscape (surface storage of soils erosion products) and in a fine materials storage in the subsurface karstic network. Within the studied river basins, the contribution of groundwater to the surface flow was established about 90 %. Concerning the sedimentary contributions to the English Channel, the extrapolation of these river sediments yields to all Norman coastal rivers (Seine-Maritime) gives a regional river sediment delivery of 48 500 t yr-1. This sediment delivery also appear to be low on global and regional scales - where the average sediment yield of the Seine River reaches 715 000 t.an-1 at Poses, the upstream limit in the estuary.
Complete list of metadatas

https://tel.archives-ouvertes.fr/tel-00919196
Contributor : Valérie Casado-Malaizé <>
Submitted on : Monday, December 16, 2013 - 2:15:57 PM
Last modification on : Monday, April 27, 2020 - 4:26:29 PM
Long-term archiving on: : Tuesday, March 18, 2014 - 4:35:14 PM

Identifiers

  • HAL Id : tel-00919196, version 1

Citation

A. Lequien. DYNAMIQUE EROSIVE ACTUELLE ET TRANSFERTS FLUVIATILES DANS L'OUEST DU BASSIN DE PARIS. Exemple de bassins versants littoraux en Haute Normandie : le Dun, la Ganzeville et l'Yères.. Interfaces continentales, environnement. Université de Rouen, 2006. Français. ⟨tel-00919196⟩

Share

Metrics

Record views

450

Files downloads

2133