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在过去的15年中,挪威在坚硬基岩中已经开挖了许多地下洞室来代替明挖水库、混凝土贮水池和钢贮水罐。这种贮水的岩石洞罐具有超过传统明挖水库的优点,尤其是,它比一般的封闭水库较容易控制污染指标。在明挖水库中,饮水面临阳光的影响和大气污染。此外,这种水库一般是建在自然的或人为的低凹地带,因此它将趋于收集周围地面排泄过来的水。如果这种水库设在居住区附近,那么将存在着被污染的地表水和地下水可能排泄到饮水之中的危险。目前,贮藏饮水用的明挖水库,一般是不符合挪威现行的卫生标准。因此对于随着必需重新设计和改造的明挖水库,不得不包括某种形式的或老式的封闭水库。
Over the past 15 years, Norway has excavated many underground caverns in hard bedrock instead of digging reservoirs, concrete tanks and steel storage tanks. This kind of water-storing rock caverns offers advantages over traditional digging reservoirs and, in particular, makes it easier to control pollution than general enclosed reservoirs. In digging reservoirs, drinking water is exposed to the effects of sunlight and air pollution. In addition, such reservoirs are generally built on natural or artificial lowland so it will tend to collect water drained from the surrounding ground. If such reservoirs are located near residential areas, there is a danger that contaminated surface water and groundwater may be drained into drinking water. Currently, open-cut reservoirs for drinking water are generally not up to the current health standards in Norway. As a result, open-cut reservoirs that have to be redesigned and rebuilt have to include some form of or older closed reservoirs.