FIELD OBSERVATION ON FLUCTUATION CHARACTERISTICS OF HOT SPRING GROUNDWATER IN IBUSUKI PORT COAST
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- イブスキコウ カイガン ニ オケル オンセン チカスイ ヘンドウ トクセイ ノ ゲンチ カンソク
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In Ibusuki port coast, a coastal improvement project is in progress applying the idea of integrated shore protection system combining jetties, offshore breakwaters, seawalls and beach nourishment. For the construction of these works, the local environment of the hot spring groundwater system named as “natural sand-steaming hot spring” should be carefully conserved, because that is an important tourism resource in the region. This study intends to estimate the impact of the beach nourishment on the hot spring groundwater. Comprehensive field observations continued for four seasonal periods on the groundwater levels and temperatures have been conducted to understand their fluctuating characteristics under the tidal motions. From the observation results of the groundwater levels and temperatures, their horizontal, vertical and temporal variations have been analyzed. The characteristic behaviors of the groundwater flows, such as a cold seawater mass penetrates into the hot groundwater flows during flood tide, a hot water mass seeps out on the surface of the sandy beach during ebb tide, have been confirmed.
- Journal of Japan Society of Civil Engineers, Ser. B2 (Coastal Engineering)
Journal of Japan Society of Civil Engineers, Ser. B2 (Coastal Engineering) 74 (2), I_85-I_90, 2018
Japan Society of Civil Engineers