CGRG Bibliography of Canadian Geomorphology
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Author : Buffin-Bélanger, T.; Lelièvre, M.A.; and Morneau, F.
Date : 2009.
Title : The study of fluvial hazards using the hydrogeomorphological method: An illustrated example for the valley of Rivière-au-Renard, Québec.
Publication : CANQUA–CGRG Biennial Meeting. May 3-8, 2009. Simon Fraser University, Burnaby Campus, Burnaby, British Columbia.
Issue : Programme and Abstracts Volume.
Page(s) : 47.
Abstract
On august 9th 2007, a major flood occurred in Rivière-au-Renard on the Gaspé peninsula, Québec. As a result, two people died and tens of millions of dollars in infrastructure damage were reported. The flood wave was extremely rapid but the amplitude of the response to the precipitation seemed disproportioned. This poster aims at underlying the importance of a better understanding of the fluvial dynamics of small streams for the determination of flood risk zones. We present a complementary method to the classic hydraulic approach to evaluate the flood risk zones and we illustrate the method for the Rivière-au-Renard region. The hydrogeomorpological method is based on the principle that the outer limits of a stream’s flood plain represent the outer envelope of past floods. Inside the boundary of the modern flood plain, the intrinsic limits of frequent, rare and exceptional flood envelopes are determined by the use of aerial photographs and field surveys. Furthermore, the hydrogeomorphological method sheds light on the factors that might have exacerbated the hydrological response in the Rivière-au-Renard valley. A better understanding of the fluvial processes on a flood plain leads to a better determination of flood risk
Bibliography of Canadian Geomorphology