Response Model for Urban Area Source Pollution and Water Environmental Quality in a River Network Region

Abstract

With the development of cities, urban area source pollution has become more severe and a significant source of water pollution. To study the relationship between urban area source pollution and water environmental quality in a river network, this study uses a city in the Yangtze River Delta, China, as an example. The Storm Water Management Model (SWMM) model and the MIKE11 model were combined into a unified modeling framework and used to simulate dynamic changes in the water quality of a river network under light rain, moderate rain, and heavy rain. In the study period, the annual urban area source input loads of potassium permanganate (CODMn), total phosphorus (TP), and ammonia nitrogen were 29.8, 0.9, and 4.8 t, respectively. The influence of light rain on the water quality of the river network was lagging and temporary, and rainfall area pollution was the primary contributor. Under the scenario of moderate rain, overflow from a pipeline network compounded rainfall runoff, resulting in a longer duration of impact on the water quality in the river. Additionally, the water quality in the river course was worse under moderate rain than under light or heavy rain. Under the scenario of heavy rain, rain mainly served a dilutive function. This research can provide support for urban area source pollution control and management.

Multiple Evaluations of the Spatial and Temporal Characteristics of Surface Water Quality in the Typical Area of the Yangtze River Delta of China Using the Water Quality Index and Multivariate Statistical Analysis: A Case Study in Shengzhou City

“…The contradiction between the status of resources and environment, and the development of society and economy is gradually emerging, making the Yangtze River Delta an ecologically fragile region. As a result, it is a matter of great urgency to understand the reasons for surface water quality change [11].…”

Analysis of the Source Tracing and Pollution Characteristics of Rainfall Runoff in Adjacent New and Old Urban Areas

“…The old urban areas, such as Taizhou City in the Yangtze River Delta region of China, have existed for a long time. The ground in this region has poor water permeability, coupled with serious rain and sewage mixed flow, and more overflows at the outfall, making the river waters in the old urban area black in color during the rainy season [13]. The new urban area is built at the edge of the old urban area, with clear land type divisions and modern and effective rainwater and sewage pipeline systems.…”