- Title
- Geomorphology and sedimentology of the Mogo Creek fluvial delta, NSW, Australia
- Creator
- Erskine, Wayne D.; Borgert, Ruth
- Relation
- HP1, IAHS-IAPSO-IASPEI Assembly. Deltas: Landforms, Ecosystems and Human Activities: Proceedings of HP1, IAHS-IAPSO-IASPEI Assembly (Gothenburg, Sweden 22-26 July, 2013) p. 218-225
- Publisher
- International Association of Hydrological Scienes (IAHS)
- Resource Type
- conference paper
- Date
- 2013
- Description
- Mogo Creek is an active sand-bed stream that drains a 213-km2 basin and flows into a blocked valley lake that functions as a terminal sediment sink. The blocked valley lake, in turn, discharges into the main stream, Macdonald River. A Gilbert-type fluvial delta has formed where Mogo Creek flows into the lake and a reverse delta has formed where the Macdonald River back floods into the blocked valley lake. The development of the fluvial delta since 1848 has been documented from a combination of maps, vertical air photographs and field surveys. The Mogo Creek fluvial delta prograded into the lake as a series of lobate sand bodies that episodically changed direction over time. Over a 13.5-year period 71 700 m3 of sand (94 600 t) was deposited on the delta plain and in the river channel and 1042 m3 (1150 t) was deposited on the delta front. Sediment bulk densities were determined so that the total delta depositional mass was computed as 95 790 t or 7095 t/year. Progradation of the delta front has segmented the lake by blocking a former side bay. Topset beds include channel sands and overbank deposits of levee sands, sand splays, chute sands and marsh muds. Foreset beds are delta front sets of planar tabular medium and coarse sands. Bottomset beds are horizontally-laminated prodelta sandy muds grading into massive, low density, lacustrine muds. From our survey of the lake volume, present rates of delta progradation will totally infill the blocked valley lake in 48 years.
- Subject
- blocked valley lake; delta lobes; lake segmentation; Gilbert delta; Australia; sand splays; delta facies model
- Identifier
- http://hdl.handle.net/1959.13/1341885
- Identifier
- uon:28840
- Identifier
- ISBN:9781907161360
- Language
- eng
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