Geomorphic Controls on Historical Channel Planform Changes on the Lower Pages River, Hunter Valley, Australia
Bibliographic Data
| ID | 8383118 |
|---|---|
| Authors | WAYNE D ERSKINE (Hunter Water, corresponding author) |
| Year | 2011 |
| Volume | 42 |
| Issue | 3 |
| Pages | 289-307 |
| Publication date | 2011-09-01 |
| Open Access | No |
| Type | ARTICLE |
| Venue | Australian Geographer (JOURNAL) |
| Journal identifiers | ISSN: 0004-9182 • E-ISSN: 1465-3311 |
| Publisher | Informa UK Limited (PUBLISHER • GB) |
| DOI | 10.1080/00049182.2011.595768 |
| OpenAlex | W2088297506 |
| Language | EN |
| References cited | 42 |
Historical planform changes in a 14.7 km reach of the lower Pages River were determined to assess whether they were autogenic (inherent in the river regime) or allogenic (driven by external changes) in nature so as to better focus river management activities and river restoration works. A pattern metamorphosis or complete change in river morphology occurred during the February 1955 flood. The peak discharge of this event exceeded the slope and grain size (intrinsic) threshold for braiding, converting the narrow, slightly sinuous stream to a wide, braided-like river. Five subsequent intrinsic threshold-exceeding floods did not cause further bar development because an over-widened channel already existed. Autogenic channel planform changes included sinuosity variations due to lateral migration and pattern metamorphosis due to the exceedance of a discharge–slope–grain size geomorphic threshold. Allogenic channel planform changes included: (1) realignment/channel straightening and artificial cutoffs by river training works; (2) lateral migration by increased bank erodibility due to riparian vegetation clearing; (3) lateral migration by the operation of a transitive geomorphic threshold involving the onset of a flood-dominated regime after 1946 and increased catchment runoff after 1830 due to large-scale clearing of catchment vegetation; and (4) the occurrence of a large flood in February 1955. Multiple forcing factors have clearly caused historical channel planform changes of the lower Pages River, making the design of river management and restoration works a complex matter outside the scope of simple formulaic protocols
Archaeology · Bank · Bank erosion · Cartography · Channel (broadcasting · Clearing · Drainage basin · Erosion · Flood myth · Floodplain · Geography · Geomorphology · Geotechnical engineering · Habitat · Hydrology (agriculture · Planform · Riparian zone · River morphology · Sediment · Sinuosity · Stream power · Vegetation (pathology · Ecology · Geology · Hydrology and Sediment Transport Processes · Hydrology and Watershed Management Studies · Soil erosion and sediment transport
Gradational Thresholds and Landform Singularity
Geomorphic Thresholds
Landscape Sensitivity and Change
River metamorphosis and environmental change in the Macdonald Valley, New South Wales, since 1949
Hydrogeomorphic Effects of River Training Works
Rainfall, floods and river channel changes in the upper Hunter
Thresholds and lags in geomorphologic changes
River Channels
| Highly cited | No |
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