نتایج جستجو برای: runoff modeling is carried out using hec
تعداد نتایج: 8845455 فیلتر نتایج به سال:
This paper concerns the design of a geographic location system to identify urban road sections susceptible runoff accumulation through analysis efficiency surface drainage networks. To this end, combination Geographic Information Systems (GISs) and stormwater models was proposed. First, GIS hydrology tools were employed generate all information required characterise catchments geometrically. Th...
Aims & Background Assessing the vulnerability of urban areas to surface water in cities is of particular importance. Destruction of the watershed upstream of urban areas, including the destruction of vegetation and road construction, as well as the uncontrolled expansion of urban and industrial lands, reduces the infiltration and increases runoff and carries the risk of floods. This study aims ...
abstract land use change, especially natural ecosystems transformation, has high effects on soil physico-chemical as well as biological characteristics and also, has effect on runoff and soil erosion. analysis of runoff and soil erosion dynamics can be useful in improvement of management proposals and quantifying runoff and soil erosion changes. so, this research was carried out to investigate ...
HEC HMS merupakan salah satu aplikasi pemodelan yang dapat digunakan untuk memodelkan nilai limpasan harian maupun bulanan berdasarkan karakteristik DAS. Tujuan penelitian ini adalah 1) Mengkaji fisik DAS Serang direpresentasikan oleh curve number (CN) 2) aliran berupa debit puncak, volume outflow, dan waktu puncak dari hidrograf banjir terukur dengan hasil menggunakan HEC-HMS. Nilai CN ditentu...
in this investigation the effect of external field on the electron density of nanostructures of cds, cdse, cdte, gaas and polymeric structure of three, four, five and six units of cds as a kind of nanosolar cells has been studied theoretically. as modeling this system in nanodimension, molecular structures has used. specific properties of molecular structures permit us to consider different sym...
Sustainable groundwater production from karst aquifers is primarily dictated by its recharge rate. Therefore, it is essential to accurately quantify annual groundwater recharge in order to limit overexploitation and to evaluate artificial methods for groundwater enrichment. Infiltration during erratic flood events in karst basins may substantially contribute to aquifer recharge. However, the co...
اثر برخی ویژگیهای خاک بر تولید رواناب و هدررفت خاک در اراضی کشاورزی حوزه آبخیز چهلچای استان گلستان
Soil erosion is one of the most important factors affecting soil quantity and quality and is environmental problems in developing countries like Iran. It can have deteriorating effects on ecosystems. This research was carried out in farm lands of the Chehel-Chai watershed, Golestan province to investigate the effect of soil properties on runoff and soil loss. Runoff and soil loss were measured ...
The process of precipitation – runoff of each basin, is influenced by hydrologic, geomorphology conditions, geological formation and vegetation. There are different methods in drainage basins. One way to estimate the runoff height is Curve Number (CN) method. That reperesents the hydrological behavior of basin. data were collected for statistics of climate and then topographic map of 1: 25000 a...
The U.S. Army Corps of Engineers’ Hydrologic Engineering Center’s River Analysis System (HEC-RAS) is a widely used software application for performing one-dimensional and two-dimensional steady and unsteady flow river hydraulics calculations, sediment transport-mobile bed modeling, and water quality analysis. User’s of HEC-RAS have often unique applications including the coupling with other sof...
due to increasing rate of flood risk throughout the world, including iran, it is necessary to identify and prioritize flood-contributing areas for flood control activities. in this study, a new approach on unit flood response method called “flood reduction method” was introduced which is applicable to prioritization of sub-basins for flood control activities. it was used to prioritize upstream ...
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