北洛河流域TOPMODEL模型基流分割定量评估

Quantitative Evaluation of Basic Flow Segmentation Results in Beiluo River Based on TOPMODEL Hydrological Model

为探究水文模拟结果对总径流、地表径流和地下径流(基流)的影响,首先采用Mann-Kendall检验方法识别出■头水文站水文序列突变点,然后构建北洛河流域TOPMODEL水文模型,最后采用数字滤波方法分别对模拟水文过程和实测水文过程进行基流分割,并定量分析水文模型模拟结果对地表径流和地下径流的影响。结果表明:①北洛河流域径流突变年份为1994年;②率定期和验证期纳什效率系数、可决系数和相对误差绝对值分别为0.69与0.63、0.87与0.82以及18.5%与13.4%;③率定期基流指数大于验证期且大于0.75,这意味着北洛河流域基流量对河川径流的补给作用显著;④模型在非汛期径流的模拟精度优于汛期的,能够为非汛期的基流分割提供依据;⑤不同时期基流量水文过程线起伏差异较大,但其形状基本与径流过程线保持一致。

In order to explore the influence of hydrological simulation results to the runoff,surface runoff and underground runoff(basic flow),the TOPMODEL model of Beiluo River basin was constructed based on the identification of the locations of change points by Mann-Kendall mutation test method in Zhuangtou Hydrological Station.The basic flow segmentation of simulated and measured values by digital fil tering method could quantitatively analyze the influence of hydrological model to the surface runoff and underground runoff simulation.The re sults show that a、the runoff sudden change of Beiluo River basin appeared in 1994.b、Nash efficiency coefficient(NSE),correlation coef ficient(R2)and relative error(Re)are 0.69 and 0.63,0.87 and 0.82,and 18.5%and 13.4%respectively in the calibration and validation periods.c、Basic flow index(BFI)in the calibration periods is greater than the validation period and is greater than 0.75,which means that the underground runoff in the Beiluo River basin has a significant effect on the recharge of river runoff.d、The simulation accuracy of the model in the non flood period is better than that in the flood season,which can provide a basis for the non flood period base flow segmenta tion.e、The fluctuation degree of basic flow process line varies greatly in different periods,but its shape is basically consistent with the runoff process line.