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<p>In Lianyungang, abundant rainfall and heavy road traffic make road stormwater runoff severely harm urban aquatic systems. However, research on runoff pollution from different functional roads here is insufficient, and quantitative analysis of pollutant and the first flush effect is lacking. This study investigates various types of roads in Lianyungang City, Jiangsu Province, through sampling and testing of stormwater runoff to examine its pollution characteristics. It analyzes the average concentration of pollutants, including suspended solids (SS), chemical oxygen demand (COD), total nitrogen (TN), and total phosphorus (TP), as well as heavy metals such as Pb and Zn. The correlation between runoff pollutants is assessed, and the Nemerow index method is utilized to evaluate these pollutants in the runoff. The results indicate that stormwater runoff from different types of roads is contaminated, with average SS concentrations recorded at 215.68&#xa0;mg/L, 151.29&#xa0;mg/L, and 119.24&#xa0;mg/L, which exceed established limits and fail to meet Class V standards. Furthermore, significant positive correlations between SS and other pollutants are observed across the three road types. Nemerow index analysis reveals that the primary pollutants exceeding limits are SS and COD, with the highest indices for these pollutants found on Cangwu Road’s motor lane, measuring 33.21 and 22.32, respectively. This study is the first to clarify the core pollution factors and first flush patterns of stormwater runoff from different roads in Lianyungang City, and supplements the synergistic analysis of road runoff pollution in this region.</p> Graphical abstract <p></p>

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The analysis of road stormwater runoff pollution in the typical coastal city of Lianyungang, East China

  • 期刊论文

  • 发表日期：

    2025年11月24日

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  • H. Leng,
  • H. Luo,
  • R. Han,
  • W. Wu,
  • B. Song,
  • Y. Zhao,
  • B.-J. He

摘要

In Lianyungang, abundant rainfall and heavy road traffic make road stormwater runoff severely harm urban aquatic systems. However, research on runoff pollution from different functional roads here is insufficient, and quantitative analysis of pollutant and the first flush effect is lacking. This study investigates various types of roads in Lianyungang City, Jiangsu Province, through sampling and testing of stormwater runoff to examine its pollution characteristics. It analyzes the average concentration of pollutants, including suspended solids (SS), chemical oxygen demand (COD), total nitrogen (TN), and total phosphorus (TP), as well as heavy metals such as Pb and Zn. The correlation between runoff pollutants is assessed, and the Nemerow index method is utilized to evaluate these pollutants in the runoff. The results indicate that stormwater runoff from different types of roads is contaminated, with average SS concentrations recorded at 215.68 mg/L, 151.29 mg/L, and 119.24 mg/L, which exceed established limits and fail to meet Class V standards. Furthermore, significant positive correlations between SS and other pollutants are observed across the three road types. Nemerow index analysis reveals that the primary pollutants exceeding limits are SS and COD, with the highest indices for these pollutants found on Cangwu Road’s motor lane, measuring 33.21 and 22.32, respectively. This study is the first to clarify the core pollution factors and first flush patterns of stormwater runoff from different roads in Lianyungang City, and supplements the synergistic analysis of road runoff pollution in this region.

Graphical abstract