甬江干流水体主要理化因子的时空变化及水质评价  

Spatio-Temporal Variations of Main Physical and Chemical Factors and Water Quality Evaluation of Yongjiang River

作　　者：包薇红 杨国靖[2] 滕丽华[2] 商卫纯 包文辉 许银春 谭大鹏 黄平沙[2] 

机构地区：[1]宁波市环境保护科学研究设计院,浙江宁波315012 [2]浙江万里学院生物与环境学院,浙江宁波315100 [3]宁波市鄞州区环境监测站,浙江宁波315100

出　　处：《华南农业大学学报》2013年第3期324-329,共6页Journal of South China Agricultural University

基　　金：浙江省自然科学基金(LQ12E08001);宁波市科技计划项目(2010A80002)

摘　　要：通过对宁波市甬江干流13个断面周年性水样分析,研究了甬江干流水体中溶解氧(DO)、生化需氧量(BOD5)、化学需氧量(CODCr)、总氮(TN)、总磷(TP)和叶绿素a(Chl-a)含量的时空变化,结合模糊数学手段,综合评价了甬江干流不同断面和季节的水质状况.结果显示,甬江干流中DO含量与BOD5、CODCr、TN和TP呈负相关;BOD5、CODCr、TN、TP以及Chl-a等主要水质理化因子呈上游较低、中游较高、下游再次下降的变化规律;各主要理化因子多呈单峰型或双峰型的季节性变化模式.模糊数学综合分析表明,整个干流不同断面的水质由优到劣依次为:断面1>断面2>断面13>断面9>断面11>断面12>断面5>断面10>断面8>断面4>断面7>断面6>断面3,除断面1、2和9外,其他断面水质均为Ⅴ类,不同季节间的水质状况表现为冬季>春季>夏季>秋季.In order to evaluate the water quality in Yongjiang River,Ningbo,the spatio-temporal changes of DO,BOD5,CODCr,TN,TP and Chl-a were studied by analyzing water samples from 13 sections within 12 months.Comprehensive evaluation of water quality in different sections was made in fuzzy mathematics methods.The results showed that DO content was negative correlate with contents of BOD5,CODCr,TN and TP.The main water environmental factors,e.g.BOD5,CODCr,TN,TP and Chl-a,were at lower levels in the upper reaches of the river,at higher levels in middle reaches and at lower levels again at the lower reaches.The seasonal changes of main physical and chemical factors displayed unimodal or bimodal patterns in different sections.Fuzzy mathematics comprehensive analysis revealed that the water qualities of the different sections from the superior to the inferior were described in the following order： section 〉1 section 2 〉section 13 〉section 9 〉section 11〉 section 12 〉section 5 〉section 10〉 section 8〉 section 4 section 7 section 6 section 3.Water quality at the most sections,except for section 1,2 and 9,met level Ⅴ,and the seasonal change was presented as winter〉 spring 〉summer 〉autumn.

关 键 词：理化因子 季节变化 模糊数学 水质 综合评价 甬江 

分 类 号：X82[环境科学与工程—环境工程]