Hydrological Drought Occurrence in Slovakia

2018 ◽  
pp. 69-90 ◽  
Author(s):  
M. Zeleňáková ◽  
T. Soľáková ◽  
P. Purcz ◽  
D. Simonová
Keyword(s):  
Hydrological Drought ◽  
Drought Occurrence

scholarly journals Future discharge drought across climate regions around the world modelled with a synthetic hydrological modelling approach forced by three General Circulation Models

2013 ◽  
Vol 1 (6) ◽  
pp. 7701-7738 ◽  
Author(s):  
N. Wanders ◽  
H. A. J. van Lanen
Keyword(s):  
General Circulation ◽  
Reference Model ◽  
Control Period ◽  
General Circulation Models ◽  
Hydrological Drought ◽  
Severe Drought ◽  
Drought Duration ◽  
Increased Risk ◽  
The World ◽  
Drought Occurrence

Abstract. Hydrological droughts characteristics (drought in groundwater and streamflow) likely will change in the 21st century as a results of climate change. Magnitude and directionality of these changes and their dependency on climatology and catchment characteristics, however, is largely unknown. In this study a conceptual hydrological model was forced by downscaled and bias-corrected outcome from three General Circulation Models for the A2 emission scenario (GCM forced models), and the WATCH Forcing Data re-analysis dataset(reference model). The threshold level method was applied to investigate drought occurrence, duration and deficit volume. Results for the control period (1971–2000) show that the drought characteristics of each GCM forced model reasonably agree with the reference model for most of the climate types, suggesting that the climate model's results after post-processing produce realistic outcome for global drought analyses. For the near future (2021–2050) and far future (2071–2100) the GCM forced models show a decrease in drought occurrence for all major climates around the world and increase of both average drought duration and deficit volume of the remaining drought events. The largest decrease in hydrological drought occurrence is expected in cold (D-)climates where global warming results in a decreased length of the snow season and an increased precipitation. In the dry B-climates the smallest decrease in drought occurrence is expected to occur, which probably will lead to even more severe water scarcity. However, in the extreme climate regions (desert and polar), the analysis for the control period showed that projections are in these regions most uncertain. On a global scale the increase in hydrological drought duration and severity will lead to a higher impact of drought events, which urges water resources managers to timely anticipate on the increased risk on more severe drought in groundwater and streamflow and to design pro-active measures.

scholarly journals ASSESSING DROUGHT CHARACTERISTICS OF MELAKA BASIN USING JOINT METEOROLOGICAL AND STREAMFLOW INDICES

2020 ◽  
Vol 80 (1) ◽  
Author(s):  
Kee An Hong ◽  
Jer Lang Hong ◽  
Izihan Ibrahim
Keyword(s):  
Drought Index ◽  
Meteorological Drought ◽  
Hydrological Drought ◽  
Drought Indices ◽  
Severe Drought ◽  
Frequency Of Occurrence ◽  
Streamflow Data ◽  
Hydrological Droughts ◽  
Drought Occurrence ◽  
Meteorological Droughts

In this study, drought occurrence in the Melaka basin has been assessed using the meteorological and hydrological drought indices. A continuous rainfall and streamflow data of 40 years were used for drought analysis. Results show that in terms of meteorological drought index, the severe drought occurred in 1986-1988. The streamflow drought index indicates that the extreme drought occurred in 1982-1984. Further analysis based on seasonal precipitation and streamflow data shows that there is no drought for 79% of the time for the period 1960-2000 where there are hydrological records. For most of the dry and wet seasons, it is more likely that the frequency of occurrence of hydrological droughts only is higher than the frequency of occurrence of meteorological and hydrological droughts simultaneously or only meteorological droughts.

scholarly journals Future discharge drought across climate regions around the world modelled with a synthetic hydrological modelling approach forced by three general circulation models

2015 ◽  
Vol 15 (3) ◽  
pp. 487-504 ◽  
Author(s):  
N. Wanders ◽  
H. A. J. Van Lanen
Keyword(s):  
General Circulation ◽  
Reference Model ◽  
Control Period ◽  
General Circulation Models ◽  
Hydrological Drought ◽  
Drought Duration ◽  
Data Set ◽  
Drought Characteristics ◽  
The World ◽  
Drought Occurrence

Abstract. Hydrological drought characteristics (drought in groundwater and streamflow) likely will change in the 21st century as a result of climate change. The magnitude and directionality of these changes and their dependency on climatology and catchment characteristics, however, is uncertain. In this study a conceptual hydrological model was forced by downscaled and bias-corrected outcome from three general circulation models for the SRES A2 emission scenario (GCM forced models), and the WATCH Forcing Data set (reference model). The threshold level method was applied to investigate drought occurrence, duration and severity. Results for the control period (1971–2000) show that the drought characteristics of each GCM forced model reasonably agree with the reference model for most of the climate types, suggesting that the climate models' results after post-processing produce realistic outcomes for global drought analyses. For the near future (2021–2050) and far future (2071–2100) the GCM forced models show a decrease in drought occurrence for all major climates around the world and increase of both average drought duration and deficit volume of the remaining drought events. The largest decrease in hydrological drought occurrence is expected in cold (D) climates where global warming results in a decreased length of the snow season and an increased precipitation. In the dry (B) climates the smallest decrease in drought occurrence is expected to occur, which probably will lead to even more severe water scarcity. However, in the extreme climate regions (desert and polar), the drought analysis for the control period showed that projections of hydrological drought characteristics are most uncertain. On a global scale the increase in hydrological drought duration and severity in multiple regions will lead to a higher impact of drought events, which should motivate water resource managers to timely anticipate the increased risk of more severe drought in groundwater and streamflow and to design pro-active measures.

scholarly journals IDENTIFIKASI KEKERINGAN HIDROLOGI DI DAS CITARUM HULU

2015 ◽  
Vol 16 (1) ◽  
pp. 21
Author(s):  
Nyayu Fatimah Zahroh ◽  
Sara Aisyah Syafira
Keyword(s):  
Frequency Analysis ◽  
Return Period ◽  
Power Plants ◽  
Hydrological Drought ◽  
Average Period ◽  
Rainfall Frequency ◽  
Rainfall Frequency Analysis ◽  
Drought Occurrence

Intisari  DAS Citarum Hulu merupakan salah satu subdas yang paling berpengaruh di DAS Citarum dengan Waduk Sagulingnya. Besarnya debit yang masuk ke waduk menjadi sangat penting demi keberlangsungan kinerja waduk tersebut, misalnya untuk pembangkit listrik. Penelitian ini bertujuan untuk mengetahui karakteristik kekeringan hidrologi, relasinya dengan curah hujan, dan analisis frekuensi kejadian kekeringan hidrologi di DAS Citarum Hulu. Data dari pos duga air Nanjung digunakan dalam menentukan ambang batas kekeringan hidrologi yang kemudian diperoleh karakteristik kekeringan hidrologi. Hasil menunjukan bahwa rata-rata periode kekeringan di DAS Citarum Hulu terjadi mulai dari bulan Juni hingga Oktober. Terdapat keterlambatan antara waktu curah hujan turun dan waktu ketika debit naik akibat input dari curah hujan. Hasil analisis frekuensi menunjukan bahwa kekeringan maksimum yang terjadi pada tahun 1994 memiliki periode ulang 52 tahun dan kekeringan sering terjadi dengan durasi kurang dari 20 hari.  Abstract  Citarum Hulu is one of the most influential Citarum sub-basin with the Saguling Reservoir. The amount of discharge into the reservoir is very important for the sustainability of the reservoir's performance for power plants in example. This study aims to determine the characteristics of hydrological drought, its relationship with precipitation, and frequency analysis of hydrological drought occurrence in Citarum Hulu. Data from Nanjung post are used in determining the threshold of hydrological drought which then acquired the characteristics of hydrological drought. The results showed that the average period of drought in Citarum Hulu occurred from June to October. There is a lag between the time when rainfall drops and the time when the discharge rise due to the input of rainfall. Frequency analysis results showed that the maximum drought that occurred in 1994 had a 52-year return period and drought often occurs with a duration of less than 20 days.

Multi-timescale assessment of propagation thresholds from meteorological to hydrological drought

2021 ◽  
Vol 765 ◽  
pp. 144232
Author(s):  
Jiefeng Wu ◽  
Xiaohong Chen ◽  
Huaxia Yao ◽  
Dejian Zhang
Keyword(s):  
Hydrological Drought

Meteorological and Hydrological Drought Assessment for Dong Nai River Basin, Vietnam under Climate Change

2021 ◽  
Author(s):  
Vu Thuy Linh ◽  
Vo Ngoc Quynh Tram ◽  
Ho Minh Dung ◽  
Dang Nguyen Dong Phuong ◽  
Nguyen Duy Liem ◽  
...  
Keyword(s):  
Climate Change ◽  
River Basin ◽  
Hydrological Drought ◽  
Drought Assessment
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