| P number: | P212540 |
|---|---|
| Old photograph number: | A13487 |
| Caption: | Abandoned channel of River Usk, the Withy Bed, Llanvihangel Gobion, Gwent. |
| Description: | An abandoned channel of the River Usk filled with grey-brown to white clayey silt overlain by thin peat, and banks lined with alder and willow, hence the local name of Withy Bed. The channel is 30 m. across similar to the present-day Usk and represents the final silting-up of a straight reach within an ox-bow lake. The Usk still has an active meander belt at this point; before 1930 the river was 400 m. west of the photograph; today it is 200 m. west and encroaching steadily eastwards at the crown of an active meander. A range of features are associated with river meanders. Meaders form confined to a floodplain. When loops of meaders intersect they often take a short-cut and the old meander is cut off to form an oxbow lake and abandoned channels. The scars left by advancing meanders are called meander scrolls. |
| Date taken: | Sun Jan 01 00:00:00 GMT 1978 |
| Photographer: | Pulsford, J.M. |
| Copyright statement: | NERC |
| X longitude/easting: | 334500 |
| Y latitude/northing: | 209400 |
| Coordinate reference system, ESPG code: | 27700 (OSGB 1936 / British National Grid) |
| Orientation: | Landscape |
| Size: | 307.51 KB; 1000 x 668 pixels; 85 x 57 mm (print at 300 DPI); 265 x 177 mm (screen at 96 DPI); |
| Average Rating: | Not yet rated |
| Categories: | Unsorted Images, Geoscience subjects/ Sedimentary features/ Channel structure |
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