Abstract
Surface tension associated with temperature is usually considered non-negligible to affect discharge capacity of sharp-crested weir when head is low. In the study, a two-dimensional numerical model verified by experiments was applied to simulate the effect of water temperature on discharge capacity of clinging flow for a rectangular sharp-crested weir at low head levels. The results showed that with a same flow rate, differences in the elevation of free surface were minimal between different temperature levels despite a slightly higher elevation of free surface at lower water temperature. The head-discharge relationships were very similar for different temperature levels. This study concluded that the effect of water temperature on head-discharge relationships and the discharge capacity of clinging flow for a rectangular sharp-crested weir was negligible at low heads.
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