CHARACTERISTICS AND RESOURCE UTILIZATION OF DAMMED LAKE HYDROSTATIC SEDIMENTS IN UPSTREAM OF JINSHA RIVER
To address the challenge of managing substantial quantities of dredged sediments during the construction of hydropower stations,we collected hydrostatic sediment samples from the overburden riverbed at the dam site of Lawa Hydropower Station in the upstream region of Jinsha River.The sediment samples underwent analysis to determine their physicochemical properties and heavy metals concentrations.The contamination levels of heavy metals in the sediment and their associated ecological risk were assessed,followed by a discussion on the feasible resource utilization of the sediments.The findings revealed that the pH values of the sediment samples ranged from 7.77 to 7.91,indicating weak alkalinity.The coefficient uniformity(Cμ)exceeded 10,suggesting diverse particle fractions and continuous grading within the sediment.The sediment texture was classified as loam,including sandy loam and silty sandy loam.The organic matter content in sediment samples ranged from 1.33％to 1.86％,which was at a low level,indicating limited nutrient availability.The geoaccumulation index(Igec)indicated that the sediment samples were not contaminated by heavy metals.According to the potential ecological risk index,only Cd in the sediment sample collected from prospecting line Ⅰ posed a moderate potential ecological risk.The dammed lake hydrostatic sediments can serve as the substituted topsoil capping material for landscaping,or building materials.To enhance the fertility of the sediment capping layer due to its inherent lack of organic matter,it's suggested to be incorporated with local-sourced municipal sewage sludge,kitchen waste,livestock,and poultry manures along with their composts,which are rich in both organic matter and nutrients.The compressive and flexural strengths of sediment-based building materials can be improved through incorporating coal cinder,cement,or other solidification technologies.
upstream of Jinsha Riverdammed lake hydrostatic sedimentsland applicationbuilding material
万方数据
维普
