青岛市洋河下游水源地地下水调蓄开采资源评价

Resources Appraise for Groundwater in the Water Provenance of the Lower Reaches of the Yanghe River in Qingdao

洋河下游水源地以松散岩类孔隙水为主,含水层主要由第四纪冲积-冲洪积的砂及砂砾石组成。厚度一般4～8m,单井出水量可达800m3/d以上,水位埋深2～4m。主要接受大气降水渗入和上游径流补给,季节性变化明显。人工开采是其主要排泄方式,地下水动态基本处于自然状态。现状条件下区内总储存量Q储=1535.71万m3,总补给量Q补=237.31万m3/a,总排泄量Q排=245.69万m3/a,处于均衡状态。通过建立地下水水流数值模型,进行洋河下游水源地地下水调蓄开采量评价和水位预测,认为在该区以枯水期开采量6000m3/d、连续开采5个月、年开采量90万m3的开采方案,水位降深在允许范围内。因此,枯水期6000m3/d的开采量可作为洋河下游水源地的调蓄开采资源量。

There is mainly incompact terrane enriched with porous unconfined water in the water provenance of the lower reaches of the Yanghe River. The water-bearing stratum is 4 - 8 m thick mostly consisted of sand and grit belonging to the quaternary deposit of alluvium or alluvium-diluvium. The water product of single well goes beyond 800 m^3. The water level is 2 - 4 m deep mainly with water supplying of atmosphere precipitation or radial water flow in upriver area. The water exploitation is the most ways of drainage. The water dynamic is basically in a natural state with distinct seasonal changes. At the present condition, the gross supply of water in this area is that Qsupply= 2.373 1 × 10^6 m^3/a and the gross drainage is that Qdrainage= 2.456 9 × 10^6 m^3/a.The supply reaches dynamic equilibrium with the drainage. The gross water storage is that Qstorage = 15.357 1 × 10^6 m^3. By building a numerical model of groundwater current, the appraise of regulation, storage and exploitation of groundwater and the forecast of water level in the water provenance of the lower reaches of the Yanghe River have been carried out. We believe that the decline depth of water level is in a permitted scope if the water exploitation is of 6 000 m^3/d and continues 5 month with 9 × 105 m^3 per year. Therefore, the water exploitation of 6 000 m^3/d in the low water period may be considered to be the amount of resources for regulation, storage and exploitation of groundwater in this area.