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Flood is one of the most frequent natural disasters in the world; therefore, it is the focus of hydrologic research to reveal the effects of such factors as precipitation and peak discharge on the hydrological and water environments. Taking the Jialingjiang Watershed as an example, this paper collects the peak discharge data and historical data in the watershed and then studies the effects of watershed flood peaks on the hydrology and water resources and water environment in the Jialingjiang Watershed using the method combining data statistics and theoretical analysis based on the lognormal distribution model, and predicts the peak discharge in this area using the three-parameter lognormal distribution model. According to the research results, the parameter values are obtained for the Jialingjiang Watershed in the three-parameter lognormal distribution model; the three-parameter lognormal distribution model can reasonably reveal the scale effect law of the confluence area in the watershed peak discharge distribution; and the flood discharge distribution in a small watershed is significantly steeper than that in a large watershed. This study lays a theoretical foundation for the evaluation and prediction of the basic situation of hydrology and water resources in different watersheds.

THE EFFECTS OF WATERSHED FLOOD PEAKS ON THE HYDROLOGY AND WATER RESOURCES BASED ON THE LOGNORMAL DISTRIBUTION MODEL