Abstract: 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.

Key words: stratified reservoirs, water quality, discharge, stratified flow, numerical simulation