نتایج جستجو برای: hydrological drought
تعداد نتایج: 46750 فیلتر نتایج به سال:
Drought can occur at such times when variables such as rainfall depth, run-off, soil moisture, etc. show a deficiency, or variables such as temperature show an increase, or when ground water level shows a decrease in comparison with the average level. Therefore, drought can be evaluated with respect to agricultural, meteorological, or hydrological variability. In this research, considering the ...
The aim of the study is to investigate the relative importance of plant-plant interactions with regard to flooding and drought effect on perennial plant performances in wetlands. Flooding is expected to be the major driver and, accordingly, the importance of drought is hardly if ever taken into account. Focusing on five widespread species, the growth, the survival and the competitive ability of...
[1] Long memory is a hydrological property that can lead to prolonged droughts or the temporal clustering of extreme floods in a river. Analyses of 28 long (up to 145 years), continuous instrumental runoff series from six European, American, and African rivers reveal that this effect increases downstream. Simulations reproduce the increase qualitatively and show that a river network aggregates ...
1. introduction a drought is a prolonged period of water deficit and usually occurs when an area does not receive significant precipitation for a sustained period of time, say several months (chen, kuo, & yu, 2009; linsely, kohlerm, & paulhus, 1959). the effects of drought often accumulate slowly over a considerable period of time that may linger for several years even after the termination of dr...
The hydrographic specifications of the karstic spring and the recession coefficient can reflect the hydro-climatic fluctuations and physical and geological characteristics of the aquifer system recharging the spring. In this study, in order to identify the hydrological geological behavior of Khorramabad Motahhari karstic Springhead (Sarab) during hydro-climatic fluctuations, quantitative analys...
Droughts are a recurrent and natural part of the Australian hydroclimate, with evidence of drought dating back thousands of years. However, our ability to monitor, attribute, forecast and manage drought is exposed as insufficient whenever a drought occurs. This paper summarises what is known about drought hazard, as opposed to the impacts of drought, in Australia and finds that, unlike other hy...
In this research work, copula-based methodology is adopted to analyze the hydrological drought frequency. Standardized Runoff Index SRI was calculated using monthly-streamflow data for 50 years of two gauging stations in northern region Iraq. The duration and severity were extracted run theory. Three Archimedean family Gaussian copulas used compared select most appropriate copula model bivariat...
Northeast China is one of the largest agricultural regions in world and a strategically important granary for China. Information on hydrological extremes crucially water management. Yet, comprehensive studies extremes, both extreme flood drought events, based gauge large coverage observations are still lacking This study investigated observed with 124 gauges region ranging from 1950s to present...
Drought is a complex natural hazard that is best characterized by multiple climatological and hydrological parameters. Improving our understanding of the relationships between these parameters is necessary to reduce the impacts of drought. Data mining is a recently developed technique that can be used to interact with large databases and assist in the discovery of associations between drought a...
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