论文部分内容阅读
银北平原具有丰富的浅层地下水资源,同时,矿化水广有分布。地下水的水质,受地形、气候、水文地质、土壤及灌溉排水等因素的影响,形成其特有的分布规律。干旱地区的潜水水化学分布一般具有明显的水平分带特征,这是由于成土母质中含有大量可溶性盐类,在地下水的蒸发浓缩和淋滤作用下运移频繁,往往由于径流条件的改变而发生急剧的变化。贺兰山前倾斜平原,地下水埋藏深,水质佳,矿化度小于1克/升,自西向东(由洪积平原顶部——前缘——冲积平原)潜水矿化度由小变大。沿黄河一带地区,由于河流淡水的大量入渗补给,潜水矿化度一般小于1克/升,为Cl—NaMg型水,越向平原中部水质变差。由于来自东西两个方向的水平分带规律,形成平原中部一个长环状的化学分带,越趋于内环,潜水矿化度越高。
Yinbei Plain is rich in shallow groundwater resources, at the same time, mineralized water widely distributed. The quality of groundwater is affected by such factors as topography, climate, hydrogeology, soil and irrigation and drainage, forming its peculiar distribution. The chemical distribution of the submerged water in arid regions generally has obvious horizontal zonation characteristics. This is because the soil parent material contains a large amount of soluble salts and migrates frequently under the action of evaporation and concentration of groundwater and leaching. However, due to the change of runoff conditions A dramatic change has taken place. Helan mountain slope before the plain, buried deep groundwater, good water quality, salinity of less than 1 g / L, from west to east (from the alluvial plain top - front - alluvial plain) salinity from small to large. Along the Yellow River, due to the infiltration and recharge of river freshwater, the salinity of the submarine is generally less than 1 g / L, which is Cl-NaMg-type water, which deteriorates the water quality in the central part of the plain. Due to the horizontal zoning rules from both east and west, a long ring-shaped chemical zone formed in the middle of the plains. The closer to the inner ring, the higher the salinity of the submersion.