نتایج جستجو برای: risk zonation
تعداد نتایج: 944747 فیلتر نتایج به سال:
• Plant community zonation and geomorphology changed along a coastal dune segment. Variation of biogeomorphic variables alongshore correlated with shoreline trends. Two distinct ecogeomorphic states have been identified in close proximity. Identified explained by long-term change rates. Sediment retention capacity local vegetation was low due to abiotic factors. Coastal dunes are complex landfo...
One of the most important natural hazards which threatens the roads in mountainous regions are hillslope instabilities. This phenomenon is more frequent while the roads are under construction. Indentification of dangerous and susceptible areas to mass movement is especially important in order to implement some measures to control these natural phenomena.In this study mass movement hazard zo...
During recent years, landslide incidence has been increased in different areas with different reasons like change in land use and road introduction. It is necessary to research and survey that’s creation factors and identity sensitive areas to prohibit of probable damages. For this reason, This study were carried out in Northern of Tehran watershed with about 42.14 km2 area. In order to landsli...
Identifying areas with different potential to landslide occurrence is one of the primitive actions in natural resources management. In view of importance of recognizing appropriate metho d to estimate landslide, in this research, the efficiency of two methods of landslide hazard zonation including methods of Mora and Varson and Multivariate regression were compared . In this research, first, ...
rivers and runoff have always been of interest to human beings. in order to make use of the proper water resources, human societies, industrial and agricultural centers, etc. have usually been established near rivers. as the time goes on, these societies developed, and therefore water resources were extracted more and more. consequently, conditions of water quality of the rivers experienced rap...
according to the importance of obtaining accurate informations on drought conditions and it risk management for water right of major wetlands in iran, in this study climatic coefficients of palmer index for 17 watersheds in country was calibrated and zonation and their range in basins containing international wetlands were investigated. results showed that in wet conditions, in basins such as c...
This study summarizes the changes (1991-2004) in plant distribution and cover in relation to soil factors in a salt marsh impacted by surplus of water from agricultural origin. An elevation of the groundwater level was observed, which led to a homogenization in the saline gradient. The changes were reflected in a shift in vegetation distribution which included the disappearance of most of the z...
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