LAUSR

In order to understand the interactive mechanism between Mekong River and Tonle Sap Lake, long-series hydrological statistics were studied to analyze the variation characteristics, influencing factors and hydrological conditions of the reverse flow from Mekong River to Tonle Sap Lake. It was found that the reversal in the flood season lasts 122 days, with the flow volume reaching 37.7 billion m and flood peak flow reaching 8402 m/s on average. The reversal reaches the maximum in August, accounting for 43% of the total yearly volume and 17.7% of the flow in Mekong River. Main factors influencing reversal flow include the difference in the runoff and water level between Mekong River and Tonle Sap Lake, and the water level of Tonle Sap River. The hydrological conditions presupposed that the reversal flow is linearly correlated to the product of water-level of Tonle Sap River to the power of 1.36 multiplied by that water-level difference to the power of 0.46. The result is expected to provide a scientific basis for the management of Mekong Delta and Tonle Sap Lake.