نتایج جستجو برای: standardized runoff index

تعداد نتایج: 475316  

2014
Jaber Almedeij

Implementation of adequate measures to assess and monitor droughts is recognized as a major matter challenging researchers involved in water resources management. The objective of this study is to assess the hydrologic drought characteristics from the historical rainfall records of Kuwait with arid environment by employing the criterion of Standardized Precipitation Index (SPI). A wide range of...

2017
Lei Yao Liding Chen Wei Wei

In the context of global urbanization, urban flood risk in many cities has become a serious environmental issue, threatening the health of residents and the environment. A number of hydrological studies have linked urban flooding issues closely to the spectrum of spatial patterns of urbanization, but relatively little attention has been given to small-scale catchments within the realm of urban ...

ژورنال: علوم آب و خاک 2015
ساداتی نژاد, سیدجواد , صادقی, سیدهادی , قاسمیه, هدی ,

Surface runoff is one of the main causes of erosion and loss of soil fertility, sedimentation in reservoirs and reduction of river water quality. Therefore, the accurate prediction of basin response to precipitation events is very important. Hydrological models are simplified views of the actual watershed systems that can help study watershed functions in response to various inputs, and underst...

ژورنال: علوم آب و خاک 2007
محمد موسایی سنجره‌ای, , مهدی بصیری, ,

Selection of efficient indices is very important for detecting and measuring random, uniform and clumped distribution patterns of plants in different plant communities. To compare and evaluate indices of dispersion patterns of plants, three stands were selected in Nodushan, Yazd. A (50m*100m) area was selected within each stand for sampling. Sampling was randomly systematicly conducted. Measure...

Extended Abstract 1- Introduction Nowadays, forecasting and modeling the rainfall-runoff process is essential for planning and managing water resources. Rainfall-Runoff hydrologic models provide simplified characterizations of the real-world system. A wide range of rainfall-runoff models is currently used by researchers and experts. These models are mainly developed and applied for simulation...

Journal: :مرتع و آبخیزداری 0
مریم آذرخشی استادیار مجتمع آموزش عالی تربت حیدریه بهنوش فرخ زاده دانشجوی دکتری آبخیزداری دانشگاه تهران محمد مهدوی استاد دانشگاه تهران، دانشکده منابع طبیعی، ایران حسین ارزانی استاد دانشگاه تهران، دانشکده منابع طبیعی، ایران حسن احمدی استاد دانشگاه آزاد اسلامی، واحد علوم و تحقیقات تهران، ایران

iran is located in dry belt of the earth and always involved with drought in different sections. drought has already caused many losses to natural plant cover, agriculture and human society. for drought monitoring, we can use some drought indecies. in this research, the standard index of annual precipitation)siap),sandardized precipitation index (spi) and palmer drought severity index (pdsi) we...

Journal: :Environment international 2001
K Sriyaraj R B Shutes

The impact of soil filtered runoff from a section of the M25 outer London motorway (constructed in 1981) on a pond, wetland and stream in a nature reserve was investigated by monitoring water, sediment. The tissues of the emergent plants Typha latifolia and Glyceria maxima collected from the pond were analysed for the heavy metals, Cd, Pb, Cu and Zn. Macroinvertebrates were monitored in the str...

2005
J. Parajka

In this study we examine the relative performance of a range of methods for transposing catchment model parameters to ungauged catchments. We calibrate 11 parameters of a semi-distributed conceptual rainfall-runoff model to daily runoff and snow cover data of 320 Austrian catchments in the period 1987–1997 and verify the model for the period 1976–1986. We evaluate the predictive accuracy of the...

Journal: :Earth 2022

Drought is an environmental disaster related to the extremes (on a drier side) in hydrometeorology. The precipitation amount modulates drought Nepalese river basins. It vital for efficient water resources management quantify and understand drought. This paper aims characterize droughts Nepal based on standard index (SPI) rainfall anomaly (RAI) using daily data assess their impacts annual crop y...

Journal: :Journal of the American Geriatrics Society 2004
David M Jones Xiaowei Song Kenneth Rockwood

OBJECTIVES To construct and validate a frailty index (FI) that is clinically sensible and practical for geriatricians by basing it on a routinely used comprehensive geriatric assessment (CGA) instrument. DESIGN Secondary analysis of a 3-month randomized, controlled trial of a specialized mobile geriatric assessment team. SETTING Rural Nova Scotia. Participants were seen in their homes. PA...

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