融雪に伴う浸透流がコムケ湖の干潟水質に及ぼす影響  [in Japanese] INFLUENCE OF INFILTRATION FLOW ACCOMPANIED BY SNOWMELT ON WATER QUALITY IN TIDALFLATS IN LAKE KOMUKE  [in Japanese]

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Abstract

北海道北東部に位置するコムケ湖において,融雪期~夏期における干潟域での塩分や水位,干潟近辺の陸域地下水位のモニタリングと干潟域における浸透流の数値解析を行った. 現地観測の結果,陸域地下水位と干潟における水位は,融雪期において相対的に陸側の地下水位が高いことが明らかになった.さらに数値解析の結果から,陸域地下水位が高い場合では地下水位が低い場合と比べ,より広範囲にわたり塩分の上昇が妨げられていることが示された.また,地下水位が高い場合にはわずかに湧出が強く,干潟域で低塩分化していることが示された.春季において干潟域付近の塩分濃度が低く保たれることで低塩分帯に生息する水生生物が生息できる環境が生まれ,これらを餌とする多くの鳥類が春季にこの干潟域付近で観測される要因となっていることが示唆された.

 In Lake Komuke, located in the northeast of Hokkaido, salinity and water level, and groundwater level of the vicinity of tidal flats were observed in the tidal flat in the snowmelt season to summer, and numerical analysis of the infiltration flow accompanied by snowmelt. In field observation results, water level in terrestrial groundwater level and tidal flats, landward groundwater level was higher in the snowmelt season than the other season. From further results of numerical analysis, the salinity in tidal flat was forced not to increase widely in the case of high landward groundwater level than in the case of low landward groundwater level. Moreover, up-welling was slightly strong in the case of high groundwater level, and made sediment salinity lower. The aquatic organisms can live in low salinity zone kept in the tidal flat in the spring season. It is the evidence that the many birds feeding these aquatic organisms in the spring season are frequently observed.

Journal

  • Journal of Japan Society of Civil Engineers, Ser. B3 (Ocean Engineering)

    Journal of Japan Society of Civil Engineers, Ser. B3 (Ocean Engineering) 71(2), I_856-I_861, 2015

    Japan Society of Civil Engineers

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