金沙江上游堰塞湖相静水沉积物特性及其资源化利用研究

权蔚慈; 杨凯; 阚思蒙; 孙叶龙; 田应辉; 万东; 郑蕾; 程红光

doi:10.13205/j.hjgc.202408001

金沙江上游堰塞湖相静水沉积物特性及其资源化利用研究

doi: 10.13205/j.hjgc.202408001

1. 北京师范大学水科学研究院, 北京 100875;
2. 华电金沙江上游水电开发有限公司, 成都 610041

基金项目:

国家自然科学基金项目(41771496)

山东省自然科学基金项目(ZR2021ME214)

详细信息

作者简介:
权蔚慈(2000-),女,硕士研究生,主要研究方向为流域环境科学。202121470024@mail.bnu.edu.cn

通讯作者:
程红光(1971-),男,教授,主要研究方向为环境健康影响调查、非点源污染、流域污染控制和环境影响评价等。chg@bnu.edu.cn

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出版历程
- 收稿日期: 2023-09-01
- 网络出版日期: 2024-12-02

CHARACTERISTICS AND RESOURCE UTILIZATION OF DAMMED LAKE HYDROSTATIC SEDIMENTS IN UPSTREAM OF JINSHA RIVER

1. College of Water Sciences, Beijing Normal University, Beijing 100875, China;
2. Huadian Jinsha River Upstream Hydropower Development Co., Ltd., Chengdu 610041, China

摘要

摘要: 为解决水电站建设过程中疏浚大量沉积物的处置难题,在金沙江上游拉哇水电站坝址区采集了河床覆盖层中堰塞湖相沉积物样品,分析样品理化性质和重金属含量,评价沉积物中重金属污染程度及潜在生态风险,探讨沉积物资源化利用的可行途径。结果表明,沉积物样品pH值为7.77~7.91,呈弱碱性;沉积物样品不均匀系数C_μ>10,粒组较多,级配连续;沉积物样品质地为壤土,包括砂质壤土和粉砂质壤土;沉积物有机质含量为1.33%~1.86%,属偏低等级。地累积指数法(I_geo)评价结果表明,沉积物样品未受重金属污染。潜在生态风险指数法评价结果表明,仅有Ⅰ号勘探线沉积物样品中的Cd存在中等潜在生态风险。综上,拉哇水电站坝址堰塞湖相静水沉积物可作为替代表土的覆盖物用于园林绿化或建筑材料。但由于沉积物自身有机质匮乏,可以通过添加当地市政污泥、餐厨垃圾、畜禽粪便及其堆肥产品等富含有机质和营养元素的废弃物来提高沉积物覆盖层肥力。此外,还可以通过掺混矿煤渣、水泥等,利用固化技术提高沉积物基建材的抗压和抗折强度。
- 金沙江上游 /
- 堰塞湖相静水沉积物 /
- 土地利用 /
- 建筑材料
Abstract: 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 (C_μ) 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 (I_geo) 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 River /
- dammed lake hydrostatic sediments /
- land application /
- building material

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