نتایج جستجو برای: return periods

تعداد نتایج: 189176  

Journal: :Water 2022

In order to examine the relationship between rainfall return periods and flood periods, design storm approach is compared rainfall–runoff continuous simulation frequency analysis approach. The former was based on event-based hydrological simulations, while latter simulations analysis. All were undertaken employing HEC-HMS software. For analysis, Generalized Extreme Value (GEV) probability distr...

Reliable estimates of river stream fl ow and fl ood zoning maps are needed for water resourcesmanagement such as fl ood mitigation, water supply, dam construction and irrigation. Flood zoning needsaccurate data and is one of the non-structural fl ood management methods. This paper describes theapplication of HEC-RAS and GIS model to determine fl oodplains maps for the part of Sardabrud Rivertha...

Journal: :Natural Hazards and Earth System Sciences 2011

Journal: :مرتع و آبخیزداری 0
وحید پایروند 1 دانش آموخته کارشناسی ارشد آبخیزداری، دانشگاه تهران، ایران علی سلاجقه استادیار دانشکده منابع طبیعی، دانشگاه تهران، ایران محمد مهدوی استاد دانشکده منابع طبیعی، دانشگاه تهران، ایران محمدعلی زارع چاهوکی استادیار دانشکده منابع طبیعی، دانشگاه تهران، ایران

one of the most appropriate approaches for flood forecasting is using peak discharge data of hydrometric stations in each region. however, lack of such stations or short duration of data in most parts of the country, make it necessary to use some alternative methods in order to estimate the flood discharge properly. one of these approaches is regional flood analysis method that in a region usin...

2016
Ian M. Brodie Shahjahan Khan

Received XXXX; accepted XXXX Abstract Series of observed flood intervals, defined as the time intervals between successive flood peaks over a threshold, were extracted directly from eleven approximately 100-year streamflow datasets from Queensland, Australia. A range of discharge thresholds were analysed that correspond to approximately 3.7 months to 6.3 year return periods. Flood interval hist...

2011
P. J. Ward H. de Moel C. J. H. Aerts

Flood management is more and more adopting a risk based approach, whereby flood risk is the product of the probability and consequences of flooding. One of the most common approaches in flood risk assessment is to estimate the damage that would occur for floods of several exceedance probabilities (or return periods), to plot these on an exceedance probability-loss curve (risk curve) and to esti...

Journal: :مرتع و آبخیزداری 0
جلیل فرزاد مهر استادیار دانشگاه تربت حیدریه، گروه مرتع و آبخیزداری، ایران پیام ابراهیمی دانشجوی دکتری علوم و مهندسی آبخیز دانشگاه تهران، دانشکده منابع طبیعی، ایران مهدی اصلاح کارشناسی ارشد سنجش ازدور و سیستم اطلاعات جغرافیایی، ایران

predicting the hydraulic behavior of the river and flood zone determination to reduce probable damages, are among measures which in recent years has been the attention of many researchers. mazandaran province, especially the city of neka, each year is affected by the floods with different return periods; therefore, land use changes and the role of these changes were evaluated in flood zones. in...

2007
Allan Timmermann

Investors’ search for successful forecasting models leads the data generating process for financial returns to change over time which means that individual return forecasting models can at best hope to uncover evidence of ‘local’ predictability. We illustrate this point on a suite of forecasting models used to predict US stock returns and propose an adaptive forecast combination approach. Most ...

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