Surveying in shadowing function of Shenashirs and it's correction with shading mask method in Bushehr

The invention of Shenashirs is one of the methods that has been used for shadowing on the windows of a building in west direction in old and traditional part of Bushehr.In addition of shadowing role, these shades are also the monumental elements of the vernacular architecture of Bushehr but their function in the afternoons;from May to November; is not correct and they can’t provide suitable shadow for west windows.This article has been written with the aim of correction and optimization in the shadowing function of Shenashirs through computer simulation and field research in Bushehr.The findings show that the function of optimized Shenashirs by the use of shading mask method is promoted increasingly and the use of these elements is strongly possible in contemporary architecture and urban aspect of Bushehr.