Affiliation:
1. College of Design & Engineering, National University of Singapore, Singapore 119077, Singapore
2. School of Architecture, Southeast University, Nanjing 210096, China
3. School of Resource and Environmental Science, Wuhan University, Wuhan 430079, China
4. College of Geography and Planning, Chengdu University of Technology, Chengdu 610059, China
Abstract
Fast urbanization in developing countries contributes to heavier pollution in urban water environments, as urbanization enhances land development and even requires lake filling to meet urban land needs, which produces significant water runoff pollution. Centralized construction brings heavier non-point source pollution, which is one of the most crucial types of pollution in urban areas. However, the pollution caused by urbanization in infilled lake areas is lack of attention. To reduce the negative impact of pollution brought on by urbanization, it is important to monitor the characteristics of runoff water qualities and their relationship with rainfall features. In this study, runoff water quality was monitored from 10 rainfall events, totaling 157 samples in the Wuhan Shahu area, an infilled lake area, to characterize the pollutant event mean concentrations (EMCs) and to explore the different effects of land-use types. COD (chemical oxygen demand), TN (total nitrogen), and TP (total phosphorus) were selected as water quality indicators. The results show that the pollutants have a significant spatial variation. Residential runoff had the largest COD (averaged EMC = 54.02 (mg/L)) and TN (averaged EMC = 2.69 (mg/L)) pollution, while road runoff had the second largest COD (averaged EMC = 48.05 (mg/L)) and TN (2.572 (mg/L)) pollution. The TP pollution level is opposite to COD and TN, as commercial and green spaces have heavier pollution, while the differences in TP pollution levels between the four types of land are not significant. The release of organic matter and nitrogen is closely related to human activities on land types, while phosphorus emission is relatively stable, indicating that it is not easily affected or controlled. In addition, the variation in pollutants between land types is also related to a certain extent. The correlation analysis shows that parameters like antecedent dry days (ADDs), rainfall intensity, and rainfall duration most significantly affect the EMCs of commercial and green spaces. Phosphorus pollutants on roads are harder to reduce. These results may help researchers to identify the specific pollutant source and find an effective method to reduce pollution in infilled lake areas and other areas.
Funder
China Postdoctoral Science Foundation
Subject
Water Science and Technology,Aquatic Science,Geography, Planning and Development,Biochemistry
Reference40 articles.
1. Water ecological carrying capacity of urban lakes in the context of rapid urbanization: A case study of East Lake in Wuhan;Ding;Phys. Chem. Earth Parts A/B/C,2015
2. Changes of phytoplankton and water environment in a highly urbanized subtropical lake during the past ten years;Wei;Sci. Total Environ.,2023
3. Challenges for sustainable urbanization: A case study of water shortage and water environment changes in Shandong, China;Wu;Procedia Environ. Sci.,2012
4. Review of characterization, factors, impacts, and solutions of Lake eutrophication: Lesson for lake Tana, Ethiopia;Ayele;Environ. Sci. Pollut. Res.,2021
5. Spatial variations of storm runoff pollution and their correlation with land-use in a rapidly urbanizing catchment in China;Qin;Sci. Total Environ.,2010