drought Articles
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Detection of drought events in Greece using daily precipitation
In this study a method proposed by Byun & Wilhite, which estimates drought severity and duration using daily precipitation values, is applied to data from stations at different locations in Greece. Subsequently, a series of indices is calculated to facilitate the detection of drought events at these sites. The results provide insight into the trend of drought severity in the region. In addition, ...
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National drought management framework for drought preparedness in Korea (lessons from the 2014–2015 drought)
The scale of damage caused by drought is on the rise in South Korea. The country has been experiencing a 4–6-year cycle of extreme droughts at a nationwide scale. From 2014–2015, South Korea suffered from its worst drought in the past 50 years. This study aims to provide an effective drought management policy by analyzing the Korean government's response to the 2014–2015 drought under the ...
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A control chart for severity index to detect drought compares favourably to logistic regression
We describe the discovery of how a traditional control chart for the Palmer Drought Severity Index (PDSI) to detect drought compares favourably to a theoretically appropriate statistical (logistic regression) model of drought as a function of PDSI. Our empirical results are based on monthly observations of PDSI, precipitation and temperature made in Kansas since 1895. Results from the study ...
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Differences in Spatial Patterns of Drought on Different Time Scales: An Analysis of the Iberian Peninsula
The differences in spatial patterns of drought over a range of time scales were analysed by the Standardized Precipitation Index (SPI). In a climatic area with a wide range of precipitation characteristics (the Iberian Peninsula), Pearson III distribution is flexible enough to calculate the drought index on different time scales. The Pearson III distribution was adapted to precipitation ...
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Investigation of the drought–flood abrupt alternation of streamflow in Poyang Lake catchment during the last 50 years
Drought–flood abrupt alternation (DFAA) is one of the remarkable manifestations of the summer monsoon anomaly at the subseasonal scale and can result in severe damage. This study identified and analyzed DFAA in terms of streamflow in the Poyang Lake catchment over the last 50 years based on a DFAA index (DFAAI). The study also investigated the intra-annual distribution characteristics and ...
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Drought management policies – from global collaboration to national action
The article provides an overview of the development of national drought management policies (NDMP). It explores collaborative efforts that were started at the High-level Meeting on National Drought Policy – whose declaration provides the backdrop to this article – and are implemented through the World Meteorological Organization (WMO)/Global Water Partnership (GWP) Integrated Drought ...
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Comparison of different threshold level methods for drought propagation analysis in Germany
The Threshold Level Method is an approach that enables comparability across all hydrological levels. This advantage is used especially in studies on drought propagation. There are different calculation procedures for this method. The effect that the choice of a variable versus a constant threshold level method has on drought characteristics and drought propagation patterns has not been fully ...
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Drought class transition analysis through different models: a case study in North China
The standardized precipitation index (SPI) and standardized runoff index (SRI) are computed for several gauge stations in Panjiakou Reservoir catchment of Luanhe Basin, a drought prone region of North China. Based on the SPI and SRI time series, two different models, a weighted Markov chain model and a Volterra adaptive filter model for chaotic time series, were established to predict drought ...
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Evaluation of regional droughts using monthly gridded precipitation for Korea
This paper attempts to characterize regional drought using 0.5 degree reanalyzed GPCC (Global Precipitation Climatology Center) gauge-based gridded monthly precipitation data sets in Korea. Drought is a function of precipitation and long-term observed precipitation was performed to enhance this characterization. There are limited long-term records from each station, therefore, a global gridded ...
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Introduction of new datasets of drought indices based on multivariate methods in semi-arid regions
Drought is a slow and creeping worldwide phenomenon which has adversely affected arid and semi-arid regions of the world. Drought indices like Streamflow Drought Index (SDI) and Standardized Precipitation Index (SPI) offer quantitative methods for combating probable consequences of drought. In this article, the results of the drought indices trend showed that the case study suffers from ...
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Regional aspects of streamflow droughts in the Andean rivers of Patagonia, Argentina. Links with large-scale climatic oscillations
Under the current global warming trend, droughts are expected to increase, with serious implications for water resources management. This study analyzed the regional aspects of droughts in terms of streamflow deficiencies over the Andean rivers of Patagonia, Argentina. Based on the variable threshold level method, the main characteristics of streamflow droughts were obtained for the ...
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Drought analysis in southern Paraguay, Brazil and northern Argentina: regionalization, occurrence rate and rainfall thresholds
The objective of the present study is to characterize the drought occurrences in a region comprising Paraguay, southern Brazil and northeastern Argentina. To recognize the drought occurrences the standardized precipitation index at the time-scales of 3 and 6 months was applied to the rainfall records from 1961 to 2011 at 51 rain gauges located in that region. After a drought regionalization ...
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Drought management policies in Spain and the European Union: from traditional emergency actions to Drought Management Plans
Droughts are current challenges to the economic, social and environmental development of a region, as reflected in European Union (EU) water policies. In addition, the impacts of droughts can be aggravated by climate change effects, adding pressure to already water stressed areas in the EU. This paper presents a general overview of drought management policies in the EU and in Spain. The paper ...
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Application of L-moment for evaluating drought indices of cumulative precipitation deficit (CPD) and maximum precipitation deficit (MPD) based on regional frequency analysis
Two indices of cumulative precipitation deficit and maximum precipitation deficit are used for assessing the severity of drought of a certain year such that a regional frequency analysis has been carried out by L-moment. In this paper, 11 synoptic stations in Isfahan province, Iran with a semi-arid environment have been used. Hosking homogeneity test is applied for identifying a homogeneous ...
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Analysis of drought characteristics over Luanhe River basin using the joint deficit index
In order to describe the overall drought status objectively, a copula-based joint deficit index (JDI) was adopted for analyses of drought characteristics in Luanhe River basin. Monthly precipitation data from 1958 to 2011 selected from 26 rain-gauge stations were used for calculating the JDI. The JDI, which encompasses multiple deficit statuses over time scales from 1 to 12 months by using ...
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Relationship between solar activity and flood/drought disasters of the Second Songhua river basin
Based on the direct correlation method, this paper analyzes the correlation of sunspot number (SSN) and western Pacific subtropical high (WPSH) ridge index with flood/drought disasters in the Second Songhua River (SSHR) basin, combined with long sequences of SSN, WPSH ridge index, precipitation and other data. Results show that SSN is clearly correlated with flood/drought disasters, what is ...
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Drought policy in Mexico: a long, slow march toward an integrated and preventive management model
Mexico is exposed to droughts and vulnerable to their impacts. Despite a history of serious economic and social consequences from drought, until recently national water policy did not acknowledge this type of natural disaster as a priority issue. This paper analyses how drought policy in Mexico has evolved since the creation of the National Water Commission in 1989 up to 2013, when the most ...
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Quantitative assessment and prediction of drought under climate change impact in Birjand region, Iran
Drought as a natural hazard causes high amount of damages to farmers, government and different people in societies. Protecting against this phenomena can lead to decline the damage. In order to reach this aim, in the present study, A1 emission scenario, ECHO–G model and LARS–weather generator (LARS–WG) statistical downscaling method are used for downscaling parameters of minimum and maximum ...
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What Drought?
They call them "Atmospheric Rivers", essentially rivers in the sky that carry vast amounts of moisture. Like a fire hose, they have bombarded central and northern California, repeatedly. “We usually see three or four atmospheric rivers in a season,” Scott McGuire, a meteorologist with the National Weather Service office in Reno, told the San Francisco Chronicle. “We’ve ...
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Characteristics of integrated droughts based on a nonparametric standardized drought index in the Yellow River Basin, China
Most current drought indices rely on a representative parametric distribution function to fit data, which results in different tail behaviors. Additionally, a drought index based on a single variable may not be sufficient for monitoring drought conditions timely and reliably. Therefore, a nonparametric multivariate drought index (NMSDI) combined with the information of precipitation and ...
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