摘要
程海又名黑坞海,位于东经100°38—41′,北纬26°27—38′之间,即今云南省永胜县城西南20km处,是横断山区最大的一个内流高山湖泊。长期以来,程海的水量出湖略大于入湖,湖水量逐年减少,水质向咸化方向发展。本文根据1981年5月27日—6月5日对程海的综合调查资料,重点分析了1972年至1981年水质演变情况,对水质状况及成化趋势进行了初步研究。
Chenghai Lake is situated at some 20km southwest of Yongsheng Town on Yunnan Plateau. The lake area is 77.22km^2, its average water depth 25.7m and water volume about 19.87×10~6m^3.
Chenghai Lake, a first known slight salty water lake in Hengduanshan Mountains. According to the chemical analysis, the mineralization of the lake water has been gradually increasing, from less than 900 mg/L in the year 1972-1974, to 956-991mg/L in 1975-1979, and to 1004mg/L in 1981. The mineralization has an increase of about 10.4mg/L averagely. The lake water changed from fresh to brackish.
The content of main ions in the lake water is HCO_3^->CO_3^(2-)>Cl^->SO_4^(2-) and Na^4>Mg^4+>K^+>Ca^(2+), belonging to the type of C_1^(N_2). With abundant dissolved oxygen and sufficient nutrient elements in the water, this lake has favourable conditions for fishery. As the lake is getting salified successively,Chenghai Lake area is unsuitable for the development of industry and agriculture.
Being a closed lake of high mountains, according to the proximative analysis and calculation,Chenghai Lake has a total inflow of 1913.0×10~6m^3 and a total outflow of 2056.3×10~6m^3; correspondingly the salty composition carried into the lake is more than that of the outflow from the lake, hence resulting in salty composition accumulation and an increase in water mineralization.
In order to prevent the lake water from the continueons increase in mineralization, it's necessary to increase the surface runoff volume flowing into the lake, to control and raduce the water quantity for industry and agriculture; and to study the problem of restraining the evaporation from water surface.
出处
《湖泊科学》
EI
CAS
CSCD
1992年第2期60-66,共7页
Journal of Lake Sciences
关键词
咸化
程海
水质
water quality salinzation, Chenghai Lake
