潜水推流器对草海水体置换影响研究

Study on the influence of submersible water impeller on water replacement in Caohai Lake

摘要

草海属于半封闭式浅水湖泊，湖泊水动力主要依靠风场提供，因此湖泊水流流速缓慢、水体交换能力弱，污染物沉积，湖泊水质问题愈发严峻。为改善湖泊水质，牛栏江-草海引水工程引用牛栏江优质水源置换草海内原有水体，但该工程引流方案较为单一，水体置换效率不理想。为提高水体置换率并减少水资源浪费，依据整理与收集的实测数据，建立草海流域三维风场模型和二维水动力-对流扩散耦合模型，利用该模型探讨了不同入流形式和工程措施下对草海水体置换效率的改善效果。研究结果表明：(1)周围山体的存在使得草海风场不均匀分布于湖面；(2)受风的影响，湖泊流场复杂，存在多个环流阻碍水体置换进程；(3)拆除部分导流带并增设7.5 kW潜水推流器能起到“引清推污”作用，优化了水体置换过程，对于引调水工程的优化具有一定参考价值。

Abstract

Caohai is a semi-enclosed shallow water lake, relies predominantly on wind fields for its hydrodynamics, resulting in slow water flow velocities and weak water exchange capacities. Consequently, pollutant deposition has led to a deteriorating water quality situation. In an effort to improve water quality, the Niulan River-Caohai Water Diversion Project uses the high-quality water source of the Niulan River to replace the existing water in the Caohai Lake, but the drainage scheme of the project is relatively simple and the water replacement efficiency is not ideal. To enhance water replacement rates and minimize water resource wastage, based on the collection and analysis of field measurement data, a three-dimensional wind field model for the Caohai Lake basin and a two-dimensional hydrodynamic-convection diffusion coupled model were established. This model was utilized to investigate the improvement effects of water replacement efficiency under various inflow forms and engineering measures. The research findings indicated:(1) the presence of surrounding mountainous terrain result in uneven distribution of wind fields across the lake surface.(2) Influenced by wind, the lake's flow field is complex, with multiple circulation patterns that hinder the water replacement process.(3) Removing certain guide flow barriers and installing 7.5 kW submersible propellers can play a “clear water introduction and pollution pushing” role, optimizing the water replacement process. This approach holds certain reference value for the optimization of water diversion project.

关键词

风生流 / 水动力 / 水体置换 / 高原湖泊 / MIKE / PHOENICS / 草海 / 潜水推流器

Key words

wind driven current / hydrodynamic / water replacement / highland lake / MIKE / PHOENICS / Caohai / submersible water impeller

Author summay

李翰卿(1995—), 男, 工程师, 硕士, 主要从事水文水资源、水力学及河流动力学研究。E-mail: [e-mail]

基金资助

云南省科技厅重点研发计划(202203AA080010)

中国电力建设股份有限公司核心攻关技术项目(DJ-HXGG-2021-04)

中国电力建设股份有限公司核心攻关技术项目(DJ-HXGG-2021-05)

云南省数字水工程技术创新中心(202305AK340003)