كليدواژه :
منابع طبيعي , آبخيزها , Peak discharge , Cluster analysis , تحليل خوشه اي , دبي حداكثر لحظه اي , ژيومورفولوژي , كشاورزي , سيلاب ها , Geomorphologic parameter
چكيده لاتين :
The geomorphological parameters of watersheds in term of their effects on hydrological processes have been highlighted in the study and estimation of flood water. These parameters in ungauged watersheds have the most important role in hydrological estimates .The variety of the watersheds due to climatological condi-tions,soil,vegetation cover,and geology as well as the impossibility of equipping all of them with hydrometric stations can lead us to find some methods to conduct hydrologic estimates in ungauged basins by using of gauged ones. One of the ways through witch data can be generalized to other basins is determination of homogeneous watersheds. In this study geomorphologic parameters,such as area,primeter,length and slope of main stream,length and slope of basin,time of concentration,form ratio,and drainage basin,in addition variable of precipitation and forest percent have been obtained and then homogenicity of basins have been determined through cluster analysis by two methods of nearest neighbor and wards with spss software. To peresent regional formula , peak discharge data of 40 watersheds in northern part of Iran have been obtained, these peak discharge were fitted by three parameter log normal frequency distribution to find return periods from 2 to 1000 years. After then for each homogeneous region ,by using multiple regression,with discharge and geomorphologic parameters and anual rainfall,equations presents.
