不同目标函数对水文模型模拟效果的影响比较

Comparison of Effects of Different Objective Functions on the Hydrological Model Simulation

一个目标函数不能反映流量的各个方面,为研究不同目标函数对水文模型模拟效果的影响,本文以梅江流域为研究对象,采用BTOPMC分布式水文模型,运用SCE-UA算法,通过选用四种不同的目标函数(SLSE、Shift SLE、Shift SLElog与Bal Shift SLE)为目标函数分别进行模拟,比较丰水期、平水期与枯水期的模拟效果,最后分析不同目标函数对模拟结果的影响。研究发现:以Bal ShiftSLE为目标函数的时候,整体模拟效果较好;以Shift SLE为目标函数的时候,丰水期的模拟效果较好;以Bal ShiftSLE为目标函数的时候,平水期与枯水期的模拟效果较好。

One objective function can not reflect all aspects of flow. In order to study the impact of different objective functions on the simulation effect of hydrological model, this paper takes Meijiang River Basin as the research object, adopts BTOPMC distributed hydrological model, uses SCE-UA algorithm, and selects four different objective functions(slse, shift SLE, shift SLE log and BAL shift SLE)as objective functions to simulate respectively, so as to compare the simulation effect in wet season, normal season and dry season, finally, the influence of different objective functions on the simulation results is analyzed. The results showed that when Bal Shift SLE was used as the objective function, the overall simulation effect was better. When shift-SLE was used as the objective function, the simulation effect was better in wet season. When Bal Shift SLE was used as the objective function, the simulation effect was better in normal and dry seasons.