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。 Under the Rongba dam-lagoon sedimentary system, freshwater resources exist in Pleistocene sedimentary fans. This is of great importance to the Rongcheng coast, where water is scarce. Alluvial fan formed in the Quaternary glacial sea surface, the late ice rising to partially submerge, after which the coastal waters evolved into sand dam lagoon lake. The alluvial fan at the base and middle is the recharge area for fresh water, with the aqueduct separated from the overlying seawater and sand bar lagoon by the aqueduct to protect fresh water from contamination. Areas with similar conditions on the hillside have the potential to store this freshwater. This points out a new direction for finding freshwater along the coast.