昆承湖水质参数空间分布特征研究

为了分析湖泊水质参数的空间分布特征,在面积为17.57km2的昆承湖布设水质监测点18个,运用基于Arc GIS的地统计学组件分析了湖区水质参数的空间分布特性.结果表明,昆承湖水质参数的空间结构变异性是客观存在的,各主要水质参数都具有块金效应;对昆承湖水质参数进行克立格插值,并绘制空间分布图,发现湖区各主要水质参数的空间异质性比较明显.其中,DO浓度呈西高东低之势;TN和NH4 -N的高浓度区主要集中在湖东北部和东部;TP的变化最为复杂,高浓度区主要分布在东北部和湖西的部分区域;Chla除在湖心较小区域出现低值,在整个湖区浓度均较高.

Spatial distribution of water quality parameters in Lake Kuncheng

Spatial characteristics are very important for water quality assessment and environmental control of a lake. A total of 18 samples were collected in Lake Kuncheng, which has a total area of 17.57 km2. Spatial variation characteristics of the lake were studied using the geostatistical component of Arc GIS. The results document the spatial variability of the water quality parameters and the nugget effect of each parameter. Interpolation with ordinary kriging was applied to identify different levels of water pollution and then spatial structure figures were outlined. The figures show spatial heterogeneity of the main parameters. The DO concentration is higher in the west. The TN and NH 4-N concentrations are high mainly in the northeast and east. The spatial heterogeneity of TP is very complicated, with high concentrations mainly in the northeast and west. The Chla concentration is high over the whole lake except for a small area in the middle. These results should be instructive to the environmental management of Lake Kuncheng.