كليدواژه :
سرريزها , آب , استهلاك انرژي , بهره برداري , Gabion , پراكنش انرژي , Stepped gabion weir , سازه ها , Weir , طراحي , Physical model , Energy flow , توريسنگ , سرريز توريسنگي پلكاني , Energy dispersion , انرژي جريان
چكيده لاتين :
Stepped gabion weirs are composed of termed gabion, and stone have many application especially in full water rivers and steady slope as well as applying for elevation of water level, decreasing of water erosion severity of high steady rivers in mountainous area and as weirs crest and over part stairs will cause losing a large quantity of water potential energy. This study was conducted on the basis of some research conclusions on physical model of stepped gabion weirs more attention were paid to application of gabion buill and some given results were also presented in this in stance with the aim of dimensions analysis and applying of physical model froud number with general slope of down slope 1:1, 2:1 and 3:1 (horizontal: vertical) in two general state of permeable and impermeable gabion body were made and set up under passage of various flow with calculation of specific energy of water flow in downstream and upstream of models, the loss energy percentage on weirs was calculated and them with the help of some available soft wares, various conditions of flow parameters were examined and compared with each other, one the basis of this investigation we concluded that minimum velocity speed flow in minimum debi (flow) is related to weir with down slope of 1:1 and fit to impermeable model and the maximum debi (flow) is related to weir with some slope fit to permeable model. There fore the necessity of establishing the energy dispersion structures with long lenght for erosion cotrol in ceased in such cases.
