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<p>Reservoirs constitute complex hydraulic engineering systems integrating flood control, water supply, and ecological conservation‌. The sediment-water status critically mediates reservoir functionality‌, requiring comprehensive assessment of operational status, risk diagnosis, and engineering interventions through three-dimensional monitoring of water-sediment-ecosystem dynamics‌.This study systematically evaluates the Fangbian Reservoir's ecosystem through integrated GIS-based spatial analysis‌, coupled estimation security assessment models (SMP-I/DDS-MD), and a tripartite water-sediment-ecology framework. Results reveal distinct pollution gradients: TN (&gt;2000mg/kg) and OM accumulation in southern estuaries‌1, TP enrichment (300 mg/kg) near intakes with a critical depletion threshold at 30–40 cm sediment depth‌, and heavy metal gradients radiating from estuaries to reservoir center‌. Seasonal cyanobacterial dominance (46.1% biomass) during high-flow periods contrasted with rotifer prevalence in normal phases, while benthic macroinvertebrates exceeded 210 ind./m<sup>2</sup>. A phased dredging protocol prioritized TP thresholds (≥1718.18/269.23 mg/kg) with depth-optimized excavation (0.2–0.8m) and hybrid sludge treatment (&lt;60% moisture), achieving sediment stability (&lt;10cm disruption) and resource recovery (landfill/agriculture)‌. These findings advance dynamic hydraulic engineering planning and management strategies balancing ecological security and engineering efficacy.</p>

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Research on functional risk analyses and dredging planning for drinking water reservoir based on pollution investigation of sediment-water status

  • 期刊论文

  • 发表日期：

    2025年10月9日

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  • Qiuyi Ge,
  • Chengli Zhu,
  • Hong Zhang,
  • Liang Zhu,
  • Jun Cao,
  • Genxiang Feng,
  • Xin Huang,
  • Chenfei Liu

摘要

Reservoirs constitute complex hydraulic engineering systems integrating flood control, water supply, and ecological conservation‌. The sediment-water status critically mediates reservoir functionality‌, requiring comprehensive assessment of operational status, risk diagnosis, and engineering interventions through three-dimensional monitoring of water-sediment-ecosystem dynamics‌.This study systematically evaluates the Fangbian Reservoir's ecosystem through integrated GIS-based spatial analysis‌, coupled estimation security assessment models (SMP-I/DDS-MD), and a tripartite water-sediment-ecology framework. Results reveal distinct pollution gradients: TN (>2000mg/kg) and OM accumulation in southern estuaries‌1, TP enrichment (300 mg/kg) near intakes with a critical depletion threshold at 30–40 cm sediment depth‌, and heavy metal gradients radiating from estuaries to reservoir center‌. Seasonal cyanobacterial dominance (46.1% biomass) during high-flow periods contrasted with rotifer prevalence in normal phases, while benthic macroinvertebrates exceeded 210 ind./m2. A phased dredging protocol prioritized TP thresholds (≥1718.18/269.23 mg/kg) with depth-optimized excavation (0.2–0.8m) and hybrid sludge treatment (<60% moisture), achieving sediment stability (<10cm disruption) and resource recovery (landfill/agriculture)‌. These findings advance dynamic hydraulic engineering planning and management strategies balancing ecological security and engineering efficacy.