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Long-term Consequences of Upstream Impoundment

Published online by Cambridge University Press:  24 August 2009

Geoffrey E. Petts
Geoffrey E. Petts
Affiliation:
Lecturer in Applied Geomorphology, Department of Geography, University of Technology, Loughborough, Leicestershire LE11 3TU, England, U.K.
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Extract

Since 1970 a large number of environmental problems have been identified as resulting from the long-term effects of human impacts. Consideration of human activity within the environment as three orders of impact, provides a basic framework for the appreciation and evaluation of long-term problems. Consequent upon dam construction, major changes of flood magnitude and frequency and of the quantity and calibre of sediment loads (first-order impacts), will induce the readjustment of channel morphology and ecology (second-order impacts). However, the macrophytic and macro-invertebrate population, for example, are also adjusted to channel morphology—particularly channel shape and substrate composition—so that further readjustments of the macrophyte and macro-invertebrate populations may be effected by changes of channel form (third-order impacts).

Type
Main Papers
Information
Environmental Conservation , Volume 7 , Issue 4 , Winter 1980 , pp. 325 - 332
Copyright
Copyright © Foundation for Environmental Conservation 1980

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