不同空间分辨率数据组合对APEX模型模拟的影响——以金华江流域为例

Effects of different spatial resolution data combination on APEX model simulation:a case study of Jinhua River basin

以浙江省金华江流域为研究区,将DEM(30 m,1 km,10 km)、土地利用(30 m,1 km)、土壤(250 m,1 km)3种不同空间分辨率组合成的12种数据组作为驱动数据,模拟分析不同空间分辨率数据组合对APEX模型模拟结果的影响.结果表明:1)DEM为10 km时,流域的模拟效果相对不理想,30 m,1 km,10 km分辨率模拟的流域面积误差分别为1.2%,9.7%,52.8%;2)12组数据模拟的年平均产量差异不大;3)随着3类数据分辨率的降低,相较于基准数据组的模拟结果,误差呈现明显波动上升趋势.说明数据空间分辨率的变化对APEX产量模拟的影响不大,但DEM分辨率降低会对流域的模拟产生较大影响.

Taking Jinhua River basin in Zhejiang Province as the research area,12 data sets composed of DEM(30 m,1 km,10 km),land use(30 m,1 km)and soil(250 m,1 km)with different spatial resolutions were used as driving data to simulate and analyze the impact of different spatial resolution data combinations on the simulation results of APEX model.The results showed that:1)when DEM was 10 km,the simulation effect of the basin was not ideal.The basin area error of the simulation with 30 m,1 km and 10 km resolution was 1.2%,9.7%and 52.8%,respectively.2)there was little difference in the average annual output of 12 groups of data;3)with the decrease of the resolution of the three types of data,the simulation result error showed an obvious fluctuation and increasing trend compared with the benchmark data group.Therefore,the change of spatial resolution of data had little impact on the APEX yield simulation,but the decrease of DEM resolution had a great impact on the basin simulation.