Comprehensive Treatment for River Pollution in a Coastal City with a Complex River Network: A Case Study in Sanya, China

Abstract

The contamination of urban rivers substantially threatens urban ecology, public health, and general progress. Addressing this matter is complex and challenging, particularly in tidal rivers. After investigating the climate conditions, population, and distribution of rivers and pollution in Sanya, China, a hydraulic and water quality model was built for Sanya utilizing InfoWorks ICM, and a comprehensive remediation approach was proposed. The implementation of this scheme led to a substantial decrease in point and non-point sources of pollution. In particular, COD, NH3-N, and TP were reduced by 87.00%, 84.01%, and 74.24%, respectively, from point source pollution. Point source pollution was well-managed north of the bridge, with a reduction rate close to 40% for non-point source pollution. This research confirmed that pollutants are only temporarily retained in the river at high tide and are discharged as the tide recedes, thus having a limited impact on long-term pollution discharge. This research provides valuable references for applying water environment models and the comprehensive treatment of tidal river pollution. The final plan scheme is to significantly improve the water quality of Sanya’s rivers by effectively controlling the discharge of pollutants while achieving considerable cost savings of approximately CNY 1.7 billion.

Long-Term Water Quality Monitoring: Using Satellite Images for Temporal and Spatial Monitoring of Thermal Pollution in Water Resources

“…The rising water temperatures of rivers are a major environmental hazard, directly and indirectly affecting the climate of neighboring regions, aquatic ecosystems, etc., but are scarcely studied regarding other causes of surface and groundwater contamination, such as chemical loads from industry or agriculture [48][49][50][51][52][53][54][55]. The considered remote sensing sources have been demonstrated to be useful tools to detect and quantify temperature changes in rivers, and the same goes for numerous water and environmental bodies (such as aquifers, wetlands, agricultural plots, etc.)…”

“…It provides experts with spatially extensive and highly synchronized data. Thermal pollution from dams has a significant impact on the downstream river environment and ecology [48][49][50][51][52]. A case study using Landsat-8 imagery (during the period 2018-2019) shows that the Shahid Abbaspour and Gotvand Dams lead to a decrease in downstream water temperature (Figure 9).…”

“…As shown in Figures 12 and 13, these pollutants have been discharged into the river and have caused an increase in water temperature. The accessibility and volume of these pollutants have facilitated their entry into rivers [52][53][54]. By analyzing the results of temperature changes along the Karun River, it can be concluded that the pollutant sources that were present in 1999 continue to increase the temperature of the Karun River to this day (over a twenty-year period).…”

Implementasi Hukum Lingkungan dalam Penegakan Hukum terhadap Pencemaran Sungai di Bandung

“…Pencemaran sungai di Indonesia merupakan salah satu masalah terbesar dan cenderung meningkat seiring dengan pesatnya perkembangan populasi dan aktivitas manusia (River n.d.). Penurunan kualitas air terus menjadi masalah serius di perairan permukaan di seluruh dunia (Song et al 2023). Kontaminasi sungai perkotaan secara substansial mengancam ekologi perkotaan, kesehatan masyarakat, dan kemajuan umum (Fadhilah et al 2023).…”