Study the Spatial Relationship between Spring Convectional Precipitation and Topography in Northwest of Iran

Precipitation mechanisms are affected by different Patterns in various geographical regions. Recognition of these patterns can help environmental planner to manage water resources. Statistical relations between topography characteristics variables with spatial Precipitation changes on mountain regions have been considered by most of researchers. The aim of the present study if to review the effective spatial and topography characters on the springtime convectional Precipitation in the northwest of Iran based on regression models in order to specify potential places of the maximum convectional Precipitation. For this purpose, spring precipitation data for period (1980-2014) has derived from 25 climatology and rain gauge stations that are located in the region of study and DEM maps of the neighboring areas has been prepared. Topographic and geographical variables has been derived by using digital elevation models (DEM). For the purpose of development the relations between the geographical and topographic characteristics of the study area with the spring convectional Precipitations, the values of each spatial layer has been quantified. After the study of statistical and geographical relations, the share of each different geographical and topographic variables in relation with the spring convective precipitation patterns in the study area , the areas with maximum spring convectional precipitation has been determined . Then, to determine the exact spatial relation of spring convective precipitation patterns, hot spots Hot Spot analysis model was used in Geographical Information System (GIS). The results showed that convectional precipitation in the western south of region has a regular spatial pattern and high probability occurrence. Also, classified zones of convectional Precipitation (high potential zones) on the projected maps and stations with maximum precipitations confirmed that overlapped area approximately 37.1 percent. Therefore, spatial and topography factors have an important effective role in occurrence of spring convectional Precipitation.