陆源淡水流量对海岸水库海水入侵的影响

采用平板水槽系统开展了室内物理模型试验,探究了陆源地下水流量与入库地表水流量对海岸水库海水入侵的影响。结果表明:海岸水库的下盐水楔入侵长度与陆源淡水流量呈对数下降关系,随着陆源淡水流量的增大,下盐水楔入侵长度减小趋势减弱;与陆源地下水相比,入库地表水对海岸水库海水入侵的抑制作用更显著;随着陆源淡水流量增大,海岸水库库底盐分减少,上盐水楔比下盐水楔先减小、消失;通过减少地下水的开采和采取调水入库的手段可以抑制海岸水库海水入侵,缓解水库水体的咸化。

Effects of inland fresh water discharge on seawater intrusion in coastal reservoirs

Systematic indoor physical model experiments of a flat flume system were carried out to explore the influence of inland fresh water discharge on seawater intrusion in coastal reservoirs. The results show that a logarithmic decrease relationship between the invasion length of the lower saltwater wedge and the discharge of inland fresh water exists. The decrement of the invasion length of the lower saltwater wedge decreases with the increasing fresh water discharge. Compared with the groundwater, the surface water has a more significant inhibition effect on seawater intrusion in coastal reservoirs. When the discharge of inland fresh water increases, the salinity decreases at the bottom of coastal reservoirs, and the upper saltwater wedge decreases and disappears earlier than the lower saltwater wedge. Reduction of groundwater exploiting and application of water transfer into the reservoir can suppress saltwater intrusion and relieve watersalinization.