Estimation of Fresh Groundwater Discharge in the Estuarine Sandy Beach in the Teradomari-Nozumi Coast

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  • 寺泊野積海岸の河口砂浜域における淡水地下水流出量の推定
  • テラドマリ ノズミ カイガン ノ カコウ スナハマイキ ニ オケル タンスイ チカ ミズリュウシュツリョウ ノ スイテイ

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Abstract

This study aims to obtain better understanding of groundwater dynamics in coastal sandy-beach environment. The Teradomari-Nozumi Coast of the estuaries of Ohkouzu diversion channel was selected as field observation location. This sandy beach is formed by fluvial sediment supply through the above channel (maximum advance of shoreline is up to 600m). From these reasons, this coast is suitable as a study area for unconfined groundwater. The field observations and analysis of the beach groundwater for particular points along beach profile, revealed interesting characteristics include: strong correlation between groundwater fluctuations and rainfall events in a catchment area and so on. As a result, fresh groundwater supply in terms of steady flow theory is estimated to amount from 0.5 to 4.3 m3/day per meter of beach width.

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