基于SWAT与新安江模型场次洪水模拟研究及评估OACSTPCD

Most of the small and medium-sized rivers are located in the hilly areas where data is scarce,and the flood has the characteristics of sudden strong and short confluence time,which has become the focus and difficulty of the current flood control.At present,the Xin'anjiang(XAJ)model and SWAT(Soil and Water Assessment Tool)model are widely used hydrological models,but there are few studies on their comparative analysis and effect assessment in flood simulation of small and medium-sized rivers.Taking Beiliaonan River as an example,the daily-scale and hourly-scale XAJ model and SWAT model are established respectively,the calculation results of the two models in the key factors such as runoff depth,peak discharge and peak time is evaluated,and the advantages and disadvantages of each model are analyzed.The results show that,(a)during the calibration period,the average values of relative runoff error(RRE),relative peak error(RPE)and peak time error(PTE)for the XAJ model are-2.6%,-4.3%and-0.3 h,respectively,while for the SWAT model,they are-4.3%,-3.3%and-0.1 h,respectively,meaning the XAJ model outperforms the SWAT model in terms of RRE,but the SWAT model performs better than the XAJ model in terms of RPE and PTE,and the simulation of multi-peak floods;and(b)the same conclusion is reached during the validation period as during the calibration period.