Response of the Ohau River and delta to lake level lowering

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Abstract
The response of the Ohau River to a lowering of Lake Benmore of 4 m was monitored during a three‐month period when the river was carrying mean daily flows between 100 and 400 m3/s from a power station. Initially, the river degraded by up to 0·8 m for a distance of 1·3 km upstream from the lake, but during the 52‐day period of minimum lake level, the delta and lower channel aggraded by up to 0·4 m. During that period, an estimated 225 000 m3 of sediment was supplied to the delta, sufficient for rapid progradation of the delta front into the shallow lake and the observed aggradation of the channel and delta surface. Other factors, in this case receiving‐basin geometry and sediment yield, may thus control the response of a river‐delta system to relative base‐level lowering.

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