Analysis of spatiotemporal evolution characteristics of water quality in Nanyi Lake and pollution sources

Journal Information

J. Hefei Univ. Tech. (Nat. Sci.), Aug.2024, Vol.47 No.8: 1015-1020

DOI: 10.3969/j.issn.1003-5060.2024.08.002

Authors

LI Wen $ ^{1,2} $, CHU Wei $ ^{2} $, XIE Kunlun $ ^{1,2} $, XU Daqiang $ ^{2} $, HU Guangzhi $ ^{2} $

(1. School of Resources and Environmental Engineering, Hefei University of Technology, Hefei 230009, China; 2. Anhui Wanxin Environmental Technology Co., Ltd., Hefei 230088, China)

Abstract and Keywords

Abstract: Based on water quality sampling and monitoring data, this paper carries out water quality evaluation of Nanyi Lake. Single factor evaluation and comprehensive evaluation methods are adopted to analyze the spatiotemporal evolution of water quality. Cluster analysis and principal component analysis are used to identify the main factors influencing the lake water quality and determine the main sources of pollution. The results of single factor evaluation show that the water quality of Nanyi Lake from 2013 to 2021 was all in class IV and below. The evaluation results of comprehensive water quality labeling method show that the water quality of Nanyi Lake fluctuated, and the water quality was in class III on the whole, mainly manifested as nitrogen and phosphorus pollution, and the inflow of rivers had a great impact on the water quality of the lake. The main factors influencing water quality during flood season (June to August) were total nitrogen (TN), ammonia nitrogen and five-day biochemical oxygen demand (BOD $ _{5} $), which mainly came from agricultural runoff, aquaculture in outer lakes and domestic sewage sources. In non-flood season (January to May and September to December), the main influencing factors were ammonia nitrogen, TN, permanganate index COD $ _{Mn} $ (chemical oxygen demand), chlorophyll a and total phosphorus (TP), which were mainly affected by domestic sewage and internal source pollution of lake bottom. This study provides a theoretical reference for the formulation of water quality improvement plan in the lake area from the perspective of multiple pollution sources control.

Keywords: Nanyi Lake; water quality analysis; spatiotemporal evolution characteristics; pollution source analysis; nitrogen and phosphorus pollution; principal component analysis

作者信息

李雯 $ ^{1,2} $，褚巍 $ ^{2} $，谢坤伦 $ ^{1,2} $，许大强 $ ^{2} $，胡广志 $ ^{2} $

(1. 合肥工业大学资源与环境工程学院，安徽合肥 230009；2. 安徽皖欣环境科技有限公司，安徽合肥 230088)

摘要和关键词

摘要: 文章基于水质采样和监测数据开展南漪湖水质评价,采用单因子评价和综合评价法,解析水质时空演化规律,基于聚类分析和主成分分析法识别湖泊水质主要影响因子,判定主要污染来源。单因子评价结果表明,2013—2021年南漪湖水质均在Ⅳ类及以下。综合水质标识法评价结果表明,南漪湖水质呈波动性变化,水质总体上处于Ⅲ类,主要表现为氮磷污染,且入湖河流对湖泊水质影响较大。汛期(6—8月)水质的主要影响因子为总氮(total nitrogen, TN)、氨氮和五日生化需氧量(biochemical oxygen demand, $ BOD_{5} $),主要来自农田径流、外湖水产养殖和生活污水等污染源;非汛期(1—5月、9—12月)主要影响因子为氨氮、TN、高锰酸盐指数 $ COD_{Mn} $(chemical oxygen demand)、叶绿素a和总磷(total phosphorus, TP),主要受生活污水、湖底内源污染等的共同影响。该研究为制定湖区水质改善方案提供多重污染源控制角度的理论参考。

关键词: 南漪湖；水质分析；时空演化特征；污染源解析；氮磷污染；主成分分析

Funding

安徽省重点研究与开发计划资助项目（20200410720048）

合肥工业大学学报(自然科学版)

Navigation