摘要
以玉瓦水电站为对象,基于2020年7月水电站所在河段5个点位的采样调查资料,运用纵向一维水动力模型分析了饵料生物量与水动力条件的相关关系。结果表明:(1)河段中的饵料生物量普遍较低,浮游植物生物量为0.036~0.068 mg L,浮游动物生物量为0.0027~0.0058 mg L,底栖无脊椎动物生物量为0.28~0.53 mg L;(2)大坝的建设使下游水位大幅下降,降幅高达94.2%,导致上游库区的低流速为0.05 m s,下游电站尾水的高流速为2.27 m s;(3)水位的升高导致了以硅藻为优势藻的浮游植物生物量下降,而浮游动物的生物量与流速和水深呈正相关,流量和水深的增加造成了底栖无脊椎动物的生物量减少。这些发现对小型水库的鱼类保护研究具有一定的基础意义。
This manuscript takes Yuwa Hydropower Station as an example,based on in-situ observations at 5 points in the river section where the hydropower station is located in July 2020,a longitudinal one-dimensional hydrodynamic model was used to analyze the correlation between bait organisms content and hydrodynamic conditions.The results show that:(1)The overall level of bait organisms in the river section is generally low,with phytoplankton content ranging from 0.036 to 0.068 mg L,zooplankton content ranging from 0.0027 to 0.0058 mg L and benthic invertebrate content ranging from 0.28 to 0.53 mg L;(2)The construction of the dam caused a significant decrease in the downstream water level,with a decrease of up to 94.2%,resulting in a low flow velocity of 0.05 m s in the upstream reservoir area and a high flow velocity of 2.27 m s in the downstream tail water;(3)The increase of water level led to a decrease in the content of phytoplankton dominated by diatoms,while the content of zooplankton is positively correlated with flow velocity and water depth.The increase in flow and water depth has led to a decrease in the content of benthic invertebrates.These findings have certain fundamental significance for fish conservation research in small reservoirs.
作者
杨晓波
阿琼
杨四新
YANG Xiaobo;A Qiong;YANG Sixin(School of Environmental Science an d Engineering,North China Electric Power University,Beijing 102206,China;Sichuan Chuanda Ecological Environment Technology Co.,Ltd.,Sichuan 610065,China;Ecological environment monitoring center of Tibet Autonomous Region,Lhasa Tibet 850000,China;Jiuzhaigou Hydropower Development Corporation,Jiuzhaigou 623400,China)
出处
《环境影响评价》
2023年第3期56-62,共7页
Environmental Impact Assessment
关键词
小型水库
饵料生物
水动力因子
鱼类保护
small reservoir
bait organisms
hydrodynamic factor
fish protection
