苏南某市河流水质参数时空变异性研究

以苏南某市区320km2内的河流为研究对象,基于对高锰酸盐指数、NH3-N、TP3个主要水质参数的监测,应用地质统计学的变差函数球状模型和Kriging插值法,对河流有机污染指标、富营养化指标进行了空间插值,用以揭示其时空分布特征及变化趋势,并绘制了时空分布等值线图。结果表明,受不同区域污染物来源的差异、不同河道自身条件的差异和不同水期水生植物、入流水量、河水流动性的差异等因素的影响,研究区河流水质参数呈现出不同的时空变异特征;各水质参数污染均相当严重,尤以富营养化指标氮磷最为显著。

Spatial and temporal variability of water quality of city river in south Jiangsu

Rivers within 320 km2 of a city in south Jiangsu were taken as research subject to investigate the spatial and temporal variability of river water quality.Base on the monitor data of permanganate index,NH3-N and TP in low water period,flat water period and wet period,spherical model variogram and Kriging were applied to spatial interpolation of organic empoison comprehensive indexes and eutrophic indexes,so as to reveal the temporal and spatial variation features and variation trends of different water quality parameters,a contour map of space-time distribution characteristics was also drawn.The results showed that the rivers water quality parameters presented different space-temporal aberrance characteristics,which was caused by different pollutant source,different river condition and differences of water seasons,aquatic plants,even water flows,etc.These rivers were seriously polluted,especially for the eutrophic indexes of nitrogen and phosphorus.