ABSTRACT

The amount of total suspended solids (TSS) is the most visible indicator for evaluating water quality in reservoirs. Previous investigations paid more attention to TSS of the surface layer in reservoirs, while suspended particles are prone to settle, resuspend, and aggregate at the bottom of reservoir. There may be different patterns of the TSS in different depths. This study is to assess the TSS concentration by weight analysis, find the evidence of the existence of flocculated suspended particles by in situ underwater imaging analysis, and discuss the impact of the flocculation process of suspended solids on water quality in deep reservoirs. Although the TSS concentration is lower than other reservoirs with the same trophic level, many flocs were found at the bottom of the deep-water area (> 15 m) in the Biliuhe Reservoir according to the recordings of the in situ underwater camera. The further comprehensive analysis demonstrates that the fine particle in flood season and resuspension is the main source of suspended flocs at the bottom of the reservoir. While the slow settling velocity results in the flocculation of fine suspended particles and long-term residence in the bottom layer of the reservoir. TSS has a significant correlation with iron and total phosphorus. Resuspension, flocculation, and settling impact on the transport of suspended sediment and associated contaminants. The evidence from this study suggests that the impact of flocs on water quality should be further discussed to ensure water supply safety.

摘要

总悬浮固体量（TSS）是评价水库水质最直观的指标。以往的研究更多关注水库表层的TSS，而悬浮颗粒物容易在水库底部沉降、再悬浮和聚集。不同深度的 TSS 可能有不同的模式。本研究通过重量分析评估TSS浓度，原位寻找絮凝悬浮颗粒存在的证据。水下成像分析，探讨悬浮物絮凝过程对深层水库水质的影响。虽然TSS浓度低于同营养级的其他水库，但根据原位记录，碧流河水库在深水区（>15m）底部发现了很多絮状物。水下相机。进一步综合分析表明，汛期细颗粒物和再悬浮物是库底悬浮絮体的主要来源。而缓慢的沉降速度导致细小悬浮颗粒发生絮凝并长期滞留在水库底层。TSS与铁和总磷有显着相关性。再悬浮、絮凝和沉降对悬浮沉积物和相关污染物运输的影响。该研究的证据表明，应进一步讨论絮凝物对水质的影响，以确保供水安全。