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首页> 外文会议>International Symposium on Land Subsidence(SISOLS 2005) vol.1; 20051023-28; Shanghai(CN) >INFLUENCE OF DESALINATED LEAKAGE RECHARGE TO STRATUM SUBSIDENCE AT SALINE GROUNDWATER AREA IN COASTAL PLAIN
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INFLUENCE OF DESALINATED LEAKAGE RECHARGE TO STRATUM SUBSIDENCE AT SALINE GROUNDWATER AREA IN COASTAL PLAIN

机译：沿海平原盐渍地海水淡化补给量对地表沉降的影响

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摘要

Although the saline groundwater body, which has different solute with different density and distributes among the strata of later middle-Pleistocene and the Holocene Series in the east of Tianjin city, hasn't been exploited, its water level has the character of synchronic phases and different amplitude with the level of fresh water existing in the Ⅱ and Ⅲ group of aquifers in early the Early Pleistocene Epoch. That means there is hydraulic relation between them. The fresh water in the Ⅱ group of aquifers has been under quite strong exploitation for long term and the stratum subsidence has almost vanished there. The compressed clay with osmotic coefficient less than 1x10~(-3)m/d has the character of semi-permeable membrane. The difference between the osmosis pressure of saline water in upper-Pleistocene and that of fresh water in Holocene series can quicken the infiltration of surface water, this is one of the ceasing or almost ceasing of the continual compression of the stratum in the Ⅱ group of aquifers. If we appropriately increase the exploitation amount of the fresh groundwater in the Ⅱ group of aquifers to make the difference of water levels greater than the difference of osmosis pressure, desalinating leakage recharge will happen. Finally, the surface water infiltration can be quickened. As long as the exploitation amount of the fresh water in the Ⅱ group of aquifers is not usually greater than the available vertical leakage recharge, and the water level falls within a proper degree, disastrous strata compressing subsidence won't happen.
机译：尽管尚未开发出溶质不同，密度不同，分布在天津市东部中更新世和全新世系列地层之间的盐碱地下水体，但其水位具有共时相和弱相的特征。在更新世初期早期，Ⅱ，Ⅲ类含水层中存在的淡水水位变化幅度不同。这意味着它们之间存在液压关系。长期以来，Ⅱ类含水层的淡水一直受到相当大的开采，那里的地层沉降几乎消失了。渗透系数小于1x10〜（-3）m / d的压缩黏土具有半透膜的特性。上全新世盐水与全新世系列淡水的渗透压差可以加快地表水的渗透，这是Ⅱ类地层持续压缩的停止或几乎停止之一。含水层。如果适当增加Ⅱ类含水层中新鲜地下水的开采量，使水位差大于渗透压差，就会发生淡化渗漏补给。最后，可以加快地表水的渗透。只要Ⅱ组含水层中淡水的开采量通常不大于可用的垂直渗漏补给量，并且水位在适当的范围内，就不会发生灾难性的地层压缩沉陷。

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