Form and Process

Fluvial Geomorphology and Flood-Flow Interaction, Grant River, Wisconsin

Dados Bibliográficos

ID8375423
AutoresChristopher J Woltemade (Shippensburg University, autor correspondente)
Ano1994
Volume84
Fascículo3
Páginas462-479
Data de publicação1994-09-01
Peer ReviewedSim
Open AccessNão
TipoARTICLE
PeriódicoAnnals of the Association of American Geographers (JOURNAL)
Identificadores do periódicoISSN: 0004-5608 • E-ISSN: 1467-8306
EditoraInforma UK Limited (PUBLISHER • GB)
DOI10.1111/j.1467-8306.1994.tb01870.x
OpenAlexW2073793222
IdiomaEN
Citações recebidas4
Referências citadas20

Interactions between valley floor morphology and flood discharges are investigated in the 690 km2 Grant River watershed, southwestern Wisconsin. In this watershed, the conversion from natural vegetation to agriculture resulted in the development of incised meander belts along streams draining between 10 and 200 km2. These belts consist of alluvial terraces that confine flood flows to a relatively narrow portion of the valley. The present study examines interaction of this landform and the process of flooding over a range of flood magnitudes. A computer model simulates flood flows in two morphological systems: one based on the morphology measured in the field and the other representing a similar system without terraces (roughly analogous to pre-European settlement morphology). Peak discharges in the case with out terraces range from 70 to 98 percent of those in the field case. The difference between these two cases varies with the total volume of runoff. Flood discharges are rapidly transported through the meander belt in upstream reaches but inundate the wider floodplains of tributary junctions and the downstream portion of the drainage system where the meander belt is absent. The geomorphological development of the watershed exhibits positive feedbacks that maintain the spatial extent of the meander belt; that is, overbank sedimentation in headwater reaches with well-developed meander belts is as rare as it is common in the lower reaches of the watershed

100-year flood · Aggradation · Alluvial fan · Alluvium · Archaeology · Flood myth · Flood stage · Floodplain · Fluvial · Geography · Geomorphology · Hydrology (agriculture) · Landform · Meander (mathematics) · Overbank · Sinuosity · Tributary · Watershed · Archaeology and Natural History · Geology · Hydrology and Sediment Transport Processes · Soil erosion and sediment transport