A theoretical study on the axisymmetric flow into a point sink in a stratified fluid was conducted by Hino and Onishi, and its theoretical results were verified experimentally by Hino et al. But these experimental results did not explain any effects of the finite opening on selective withdrawal. Therefore, the data obtained by these experiments are insufficient to adapt in designing the actual intake structures.
The present study was conducted theoretically and experimentally to determine the effects of the dimensions of intake opening on the thickness of the withdrawal layer. Among discussed profiles of density distribution in the reservoir, both non-linear and linear types are included. And velocity distributions in stratified flow toward selective withdrawal finite opening are measured by LDV and useful estimation formula of withdrawal water quality is presented.