分层水库不同高程孔口泄流的分层流特性研究

分层型水库中不同高程孔口泄流是否能形成稳定的库内分层流对于水库水质分层泄流调控具有重要意义。针对狭长窄深分层型水库,采用垂向二维水温分层流模型对不同高程孔口泄流条件下的库内分层流进行了模拟,获得了表孔、中孔及底孔泄流所形成的分层流型态特性。初步研究表明:对于稳定分层型水库,各高程孔口泄流基本能在对应孔口吸出厚度层形成较稳定的水温分层流,且吸出厚度在空间分布上相对稳定,受其他水层影响相对较小。该结果为有针对地通过不同高程孔口泄放水库中的劣质水层创造了条件,有望为实现水库水质改善探索新的途径,并为水库多目标综合调度提供科学决策依据。

Characteristics of Stratified Flow Formed by Discharging at Different Heights of Stratified Reservoirs

Stable stratified flow is important for regulating the discharge at different heights in stratified reservoirs.In this article,a vertical 2-D temperature stratified flow model is applied to simulating the stratified flow from surface outlets,middle outlets and bottom outlets in a long and narrow deep reservoir.The characteristics of stratified flow pattern are obtained through the simulation.The study indicates that for stable stratified reservoirs,discharge at different elevations could form steady stratified flow in corresponding elevations,and the thickness of the stratified flow is relatively stable and is rarely affected by other layers,which lays a basis for the discharge of water layer of poor quality.The result offers a new approach to improve water quality of reservoirs and provides a scientific basis for the multi-objective comprehensive management of reservoir.