Sedimentary environments in Lake Pukaki, New Zealand

概要

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Sedimentary conditions in glacier-fed Lake Pukaki (20km long, 5km wide, and 98.0m deep at maximum), New Zealand were examined in the glacier-melt season of 1998. Spatial distributions of water temperature and suspended sediment concentration (SSC) obtained by a TTD (temperature-turbidity-depth) profiler indicate that sediment-laden underflow initiated near the river mouths is relatively weak because of their vertical low SSC on the gentle slope, and that the underflow is bifurcated into suspension interflow and other underflow at midlake ca. 1500m distant from the river mouths. The continuous measurement of water temperature at some depths revealed that at midlake, the suspension interflow and underflow continuously occur about one day at least.
日本堆積学会の論文