| Title |
Formation and Deformation of the Fluid Mud Layer on Riverbeds under the Influence of the Hydrological Property and Organic Matter Composition |
| Authors |
트렁틴휜 ( Trung Tin Huynh ) ; 허진 ( Jin Hur ) ; 이병준 ( Byung Joon Lee ) |
| DOI |
https://doi.org/10.15681/KSWE.2024.40.2.79 |
| Keywords |
Deposition; Erosion; Flocculation; Fluid mud; Organic matter; Suspended particulate matter |
| Abstract |
This study employed field measurements and biogeochemical analysis to examine the effects of seasonal conditions (e.g., temperature and precipitation) and human intervention (e.g., dam or weir construction) on the chemical composition of dissolved organic matter, flocculation kinetics of suspended particulate matter, and formation of the fluid mud layer on riverbeds. The results indicated that a water environment with a substantial amount of biopolymers offered favorable conditions for flocculation kinetics during an algal bloom period in summer; a thick fluid mud layer was found to be predominated with cohesive materials during this period. However, after high rainfall, a substantial influx of terrigenous humic substances led to enhanced stabilization of the particulate matter, thereby decreasing flocculation and deposition, and the reduced biopolymer composition served to weaken the erosion resistance of the fluid mud on the riverbed. Moreover, a high-turbulence condition disaggregated the flocs and the fluid mud layer and resuspended the suspended particulate matter in the water column. This study demonstrates the mutual relationship that exists between biogeochemistry, flocculation kinetics, and the formation of the fluid mud layer on the riverine area during different seasons and under varying hydrological conditions. These findings are expected to eventually help inform the more optimal management of water resources, which is an urgent task in the face of anthropogenic stressors and climate change. |