摘要
为了使新安江模型的运用更能真实反映流域的基本特征及产汇流机理,利用地理信息系统空间分析的功能,由数字高程模型导出乌江武隆以上流域的流域排水网,并在此基础上提取汇流长度及坡度等地形特征值。在地理信息系统平台上,计算出流域下垫面的植被、土壤、地貌等特征值,并将其与流域模型参数建立相关关系。结果表明,各流域模拟的确定性系数及模拟精度均较高。因此,预报结果更加合理,理论依据也更加可靠。
In order to better reflect basic characteristics of Wujiang River Basin and the mechanism of runoff yield and confluence in the application of Xin＇anjiang Hydrological Model,the drainage network of the basin is extracted by Data Elevation Model（DEM） using the spatial analysis function of GIS,on this basis,and the topographic characteristics including confluence length and slope are extracted.In the platform of GIS,we calculate the characteristic values of underlying surface such as vegetation,soil and landform,and establish a relationship between the characteristic values and parameters of the model for the basin.The results show that the simulated deterministic coefficients are large and the simulation precision is high.Therefore,the forecast results are more reasonable and the theoretical basis is reliable.
出处
《人民长江》
北大核心
2011年第6期106-108,113,共4页
Yangtze River
关键词
地理信息系统
数字高程模型
地形地貌特征值
新安江模型
GIS
Data Elevation Model（DEM）
topographic characteristics
Xin＇anjiang Hydrological Model
