Geomorphological river channel reconnaissance for river analysis, engineering and management

Authors: Thorne C.R.; Allen R.G.; Simon A.

Source: Transactions of the Institute of British Geographers, Volume 21, Number 3, September 1996 , pp. 469-483(15)

Publisher: Royal Geographical Society

Abstract:

Geomorphological studies involving river reconnaissance, analysis (both qualitative and quantitative) and assessment can supply information on the form and physical processes operating in a fluvial system. This information is of value to river engineers and managers wishing to work with, rather than against, nature when undertaking engineering and maintenance operations or devising management policies. Qualitative analysis rests on the interpretation of process from form using careful observation across the whole system, together with the application of well-established geomorphological concepts. Quantitative analyses of specific study reaches identified as critical in the broader qualitative study are based on regime theory and hydraulic geometry, whereby observed channel dimensions and features are compared with the same hydrological and sedimentary controls. The utility of geomorphological river reconnaissance is illustrated using a case study from the River Blackwater, southeast England. A geomorphological assessment is used to suggest alternative modifications to the operational maintenance regime that would allow the channel to recover more of its natural form and, thereby, promote environmental restoration of aquatic and riparian habitats.

Keywords: fluvial geomorphology; reconnaissance surveys; river channel management; River Blackwater; geomorphological data; flood defence; channel maintenance

Language: English

Document Type: Research article

Publication date: 1996-09-01

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