نتایج جستجو برای: curve number cn

تعداد نتایج: 1289252  

Journal: :Jurnal pengelolaan sumberdaya alam dan lingkungan 2023

Estimation of surface run-off in karst watersheds has not been widely carried out and the estimation method is generally developed for non-karst watersheds. This study aims to analyze accuracy river discharge at outlet Karst Biringere Sub-watershed using modified Soil Conservation Service Curve Number (SCS-CN) analyzed impact land use change on Sub-watershed. Modification SCS-CN estimating dire...

2005
M. Coskun N. Musaoglu A. Hızal

Application geographic information systems (GISs) and remote sensing integration to provide determination of runoff from watershed has performed increasingly attention in recent years. In this study, Natural Resources Conservation Service Curve Number (NRCS-CN) method was used to estimate Curve number according to the factors of hydrological soil group, land use, land treatment, drainage basin ...

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The use of new methods of Remote Sensing (RS) and Geographical Information System (GIS) in zoning the flooding potential and its variations in a particular geographical area (Tang-e-Bostanak Catchment Area) constitutes the main subjects of this study. In this regard, the production, combination, and composition of effective information layers such as K index and run off in identifying these zon...

2017
Nienie Qi Pengjie Wu Jinchao Chen Teng Li Xianghui Ning Jin Wang Kan Gong

BACKGROUND The aim of the study is to evaluate the role of cytoreductive nephrectomy (CN) with thrombectomy before targeted molecular therapy (TMT) on survival in metastatic renal cell carcinoma (mRCC) with venous tumor thrombus. METHODS We performed a retrospective analysis of 47 patients treated in our center from April 2008 to October 2014. In the study, 20 patients underwent CN with throm...

Journal: :SN applied sciences 2021

Abstract In this study, a method for estimating the exponent “ n ” values of catchment-area equations four sub-basins within poorly gauged Benin-Owena River Basin Development Authority (BORBDA) in Nigeria is presented to enable estimation flows at ungauged sites basin and determination small hydropower (SHP) potential different locations each sub-basin entire basin. Optimal prediction streamflo...

Journal: :Water 2022

The application of hydrologic modeling tools to represent urban watersheds is widespread, and calculation infiltration losses an essential component these models. curve number (CN) method widely used in such models implemented US EPA’s Storm Water Management Model (SWMM 5). SWMM 5 can be created either using CN values computed only for the pervious fraction subcatchments, or entire subcatchment...

2007
A. SVOBODA A. Svoboda

This paper describes the use of a simple two stage rainfall-runoff model in which a curve number (CN) principle is used to calculate the soil water content and, subsequently, the rainfall contribution to direct runoff and groundwater flow. The maximum soil water retention, S, is used to express various characteristics of a catchment (infiltration rate, soil cover and land use, as in the CN meth...

Journal: :Computer Aided Geometric Design 2000
Erich Hartmann

A method for parameterizing nearly arbitrary implicit plane/space curves and surfaces is introduced. The parameterizations are of class Cn−1 if the given curves/surfaces are of class Cn. The computation of points and derivatives is performed numerically. These parameterizations can be used for controlled determination of points on curves and surfaces and for the application of developed techniq...

ژورنال: آبخیزداری ایران 2022

The SCS-curve number is one of the common methods to estimate drirect runoff in the watershed scale. There is often an uncertainty in predicting runoff in many areas due to to the model’s assumption on the initial abstraction ratio (l= 0.20). This study was conducted to evaluate the accuracy of SCS-CN method in estimating runoff in some semi-arid subbasins of the Aras river consits of the Livar...

Extensive flood damages all over the world necessitate its control and operation. Hydrologic impacts of land use change appear in many ways such as total runoff, and flood peak flow. This study was performed in 2014 and aimed to investigate the impacts of land use changes on the occurrence of floods in the catchment of Boostan dam in Golestan province, Iran. For this purpose, Watershed Modeling...

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