An explanation is given for the formation of thermal fronts for outfall Froude numbers in the range of F≤ 3.3. It is shown that the homogeneous round jet has a characteristic natural frequency in the range of 0.3<St<0.5 which is damped out beyond x/D≥5. It is suggested that further investigation of the phenomena of thermal fronts is necessary.
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Joan Gosink (1982) studied this question.
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