IAG 1999 Regional Conference on Geomorphology
Gloria Hotel of Rio de Janerio, Brasil, July 17-22, 1999
Abstracts - Sandra Baptista da Cunha and Antonio Jose Teixeira Guerra (Eds.)

HILLSLOPE EROSION - STRATEGIES OF DEFENCE

Hiller, D.A.

University of Essen, Denmark
E-mail: dieter.hiller@uni-essen.de


In the region of the left side of the Lower-Rhine in North Rhine-Westphalia there is a push moraine. The hillside facing the former moraine is more steeply formed while the terrain on the other side shows a flat westward hillside. The fertile soils are agriculturally used. After heavy rain falls run-off causes large losses of soil on the east slope side. In the autumn of 1998 ditches and also gullies (up to 1.8 m depth, 1.5 m with and several 10th of metres long) occurred. The eroded soil material is deposited in the fields on the bottom of the ridge, on residential areas which border the ridge and cause a lot of damages on the traffic network, the sewage and on buildings. Field and laboratory investigations showed that these intolerable soil erosions are caused by long stretched hillslopes (up to 600 m) without dividing transverse structures, from puddled soil surfaces and from the intensive growing of crops which cover the soil late in the vegetation period. In order to protect the fields and the residential areas permanently from the impacts of the soil erosion a work group is active to devise a basic plan. The intention is to introduce plant production measures against erosion, as well as a decreasing and preventing tillage by changing the crop production. These measures can be combined with hillslope division elements. A further important constituent of this concept is to develop a method how to deal with major soil erosions. This method, will be published in a manual, guiding people concerned with similar soil erosion problems on other places in Germany.


© 2001 International Association of Geomorphologists
All rights reserved