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岱海是我国北方半干旱地区的一个内陆湖,近几十年来,由于受到人类活动的强烈干预,湖泊水位持续下降,湖水水质出现恶化,2004的水质调查数据显示,目前岱海湖水矿化度4 658.6mg/L,已接近咸水湖标准。从近50年的变化历程来看,岱海呈现出明显的咸化趋势,且咸化速度不断加快。利用流域内的水文、气象数据,并结合湖泊及河流的水化学特征,建立岱海盐量平衡方程,对岱海湖水矿化度进行模拟计算,恢复了近50年岱海湖水矿化度的变化序列。依此序列对岱海水质咸化的影响因子进行量化计算,结果显示:湖泊萎缩对水质咸化的影响占到86.5%,而由入湖径流与降水所带入的盐分对水质咸化的影响仅占到13.5%。
Daihai is an inland lake in the semi-arid area of northern China. In recent decades, due to the intense human intervention, the water level of lakes continues to decline, and the water quality of the lake has deteriorated. According to the water quality survey data of 2004, the current Daihai Lake water salinity 4 658.6mg / L, is close to the lagoon standard. From the change course of nearly 50 years, Daihai shows obvious salty trend, and the speed of salinization continues to accelerate. Based on the hydrological and meteorological data in the basin and the water chemistry characteristics of lakes and rivers, the salt balance equation of Daihai Lake was established and the salinity of Daihai Lake was simulated and the change of salinity of Daihai Lake in the past 50 years was recovered sequence. According to this series, the influence factors of water salinization in Daihai were quantified. The results showed that the impact of lake shrinkage on water salinization accounted for 86.5%, but the effect of salinity brought by runoff and precipitation into water salinization Only accounted for 13.5%.