山东荣成砂坝潟湖下第四纪淡水资源

GROUNDWATER RESOURCE IN THE QUATERNARY ALLUVIAL FAN UNDER BARRIERLAGOON SYSTEM IN RONGCHENG COUNTY, SHANDONG PROVINCE

荣成沿岸砂坝-泻湖沉积体系之下、更新世沉积扇之中存在淡水资源。这对严重缺水的荣成沿岸有重要意义。冲积扇形成于第四纪冰期低海面时,冰后期海面上升使之部分地淹没,之后近岸水域演化为砂坝泻当湖。冲积扇的根部和中部是淡水的补给区,前缘以隔水层与上覆的海水和砂坝泻湖沉积隔开,保护淡水不受污染。山丘海岸具有类似条件的地区均有富存这种淡水的可能性。这为寻找沿岸地下淡水指出了新的方向。

Groundwater resources exist in the pleistocene alluvial fans under barrier-lagoon systems of Rongcheng county, Shandong Province, which were formed during Quaternary low-standing of sea level, and have partly inundated by sea since post glacial transtression. The near-shore zones, then, have eviluted into barrier-lagoon system. The upper-middle fans are supply areas of the groundwater and the middle-low fans which underlie sea water or barrier-lagoon deposits, are protected from intrusion of sea water by insulated clayey sediments. There is a possibility of existence of such groundwater in the coastal zones with the same condition as that in Rongcheng county.