基于反距离权重插值法的抽水型水库水质空间分布分析

Distribution of Water Quality in a Pumped Storage Reservoir Based on Inverse Distance Weighted Interpolation

抽水型水库的运行方式和水动力特征决定了其在上水时和不上水时水质空间分布的差异性,采用反距离权重插值法对水洞沟水库的水质进行空间分布研究。结果表明:上水时,进水口附近的化学需氧量(CODCr)质量浓度超过Ⅲ类水体的标准限值(20 mg/L);全库区总氮(TN)的质量浓度亦超过Ⅲ类水体的标准限值1.0 mg/L;不上水时,由于水体自净作用,污染物质量浓度比上水时降低,仅在取水口附近总氮(TN)出现超标现象。插值结果使得水质空间分布特征更具全面性,为分时段分区域进行库区的污染物控制提供参考。

The operation mode and hydrodynamic characteristics detemline the diflerence of spatial distribution of water quality when inflow and no-inflow in a pumped storage reservoir. The inverse distance weighted interpolation is adopted to study the spatial distribution of water quality in Shuidonggou reservoir. The results show that CODcr concentration in area near inlet is more than class Ⅲ water standard limitation of 20 mg/L. All of the TN concentrations are more than class Ⅲ standard limitation of 1.0 mg/L. Due to the water self-purification, pollutant concentration is lower in no-inflow phase than in inflow phase. However, only near the inlet, the concentration of TN exceeds limitation. The interpolation results ereat more comprehensive spatial distribution characteristics of water quality, which will provide the reference for pollution control in diflerent period and diflerent area of a pumped storage reservoir.