无资料嵌套流域水文相似性及参数移植研究

以江西赣江的虎山流域(嵌套香屯、婺源和德兴流域)和南城流域(嵌套南丰和沙子岭流域)两组嵌套流域为研究区域,对比基于嵌套的参数移植方法与基于相似的参数移植方法;采用相似性指标排列组合法识别在相似性判断中起主要作用的指标;并初步探究了参数移植的方向性问题。结果表明基于嵌套的参数移植与基于相似的参数移植效果均较好;地形指标和土地利用/覆盖在判断流域相似性时起主要作用,采用它们作为相似性指标开展参数移植效果最优;基于嵌套的参数移植与基于相似的参数移植均不能避免参数移植方向性问题,基于地形指标和土地利用/覆盖作为相似性指标的参数移植可降低参数移植方向性的影响;此外研究发现,采用不同相似性指标排列组合开展参数移植方向性问题研究是一条值得进一步探索的途径。

Study on hydrological similarity and parameter transplantation of dataless nested watershed

Two sets of nested watersheds,the Hushan watershed (nested by Xiangtun,Wuyuan,and Dexing watersheds) and the Nancheng watershed (nested by Nanfeng and Shaziling watersheds), of the Ganjiang River in Jiangxi Province were used as study areas. Two methods of parameter transplantation based on nested watershed and similar watershed were compared;the similarity criteria combination and analysis method was used to identify the criteria that play major roles in similarity judgment;and the directionality problem of parameter transplantation was explored preliminarily. The results show that parameter transplantation based on nested watershed and similar watershed both perform well;topographic features and land use/cover play major roles in judging the similarity of watersheds,and parameter transplantation based on ther generated the best result; Parameter transplantation based on nested watershed and similar watershed can''t avoid the directionality problem. Parameter transplantation based on topographic features and land use/cover as similarity indicators can reduce the impact of directionality problem. In addition,it is found that the research on directionality problem of parameter transplantation by using different similarity criteria combinations is a way worthy of further study.