FIELD OBSERVATION ON FLUCTUATION CHARACTERISTICS OF HOT SPRING GROUNDWATER IN IBUSUKI PORT COAST

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  • MIYAKE Takatomo
    株式会社エコー事業本部環境系事業部沿岸環境部
  • UNO Yoshiyuki
    株式会社エコー事業本部防災系事業部環境解析部
  • ONO Nobuyuki
    株式会社エコー事業本部防災系事業部環境解析部
  • YUKIMARU Toshiaki
    国土交通省九州地方整備局鹿児島港湾・空港整備事務所海岸課
  • KUBO Toshiya
    前 国土交通省九州地方整備局鹿児島港湾・空港整備事務所
  • NAGAYAMA Akio
    鹿児島大学学術研究院 海洋土木工学専攻
  • ASANO Toshiyuki
    鹿児島大学 地震火山地域防災センター

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Other Title
  • 指宿港海岸における温泉地下水変動特性の現地観測
  • 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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Description

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.

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