Hydrological Drought Assessment in Northwestern Iran Based on Streamflow Drought Index (SDI)

2012 ◽  
Vol 27 (1) ◽  
pp. 137-151 ◽  
Author(s):  
Hossein Tabari ◽  
Jaefar Nikbakht ◽  
P. Hosseinzadeh Talaee
Keyword(s):  
Drought Index ◽  
Hydrological Drought ◽  
Drought Assessment ◽  
Northwestern Iran ◽  
Streamflow Drought Index

scholarly journals A 40-Year Analysis of the Hydrological Drought Index for the Tigris Basin, Turkey

Water ◽  
2019 ◽  
Vol 11 (4) ◽  
pp. 657
Author(s):  
Arzu Ozkaya ◽  
Yeliz Zerberg
Keyword(s):  
Drought Index ◽  
Resource Planning ◽  
Hydrological Drought ◽  
Severe Drought ◽  
Drought Assessment ◽  
Flow Monitoring ◽  
Monthly Streamflow ◽  
Streamflow Data ◽  
The Time Domain ◽  
Almost All

Drought is a natural disaster that occurs globally when water availability is significantly below normal levels. Drought assessment is important for water resource planning, and therefore indexes can be used to characterize drought magnitudes. Using the monthly streamflow data at 47 stations from 1972 to 2011, the streamflow drought index (SDI) series with 3- (SDI-3), 6- (SDI-6), and 12-month (SDI-12) time scales were calculated, and the hydrological drought of the upper Tigris Basin in Turkey has been assessed. The results showed that almost all stations experienced at least one severe drought during the study period. The results revealed that since the early 1990s the study area has become drier. Using the data for a 12-month period and the area of the sub-basins for each flow monitoring station, area-weighted SDI-12 (WSDI) values were constructed. According to the WSDI results, the intensity and number of drought conditions increased during every 10-year period. This outcome has been verified using the maps of averaged SDI-12 values over the Tigris Basin. We noticed from observations of the maps that the time domain zones in lower latitudes experienced drought earlier as compared with zones in higher latitudes.

scholarly journals Hydrological Drought across Peninsular Malaysia: Implication of Drought Index

2021 ◽  
Author(s):  
Hasrul Hazman Hasan ◽  
Siti Fatin Mohd Razali ◽  
Nur Shazwani Muhammad ◽  
Asmadi Ahmad
Keyword(s):  
Time Scales ◽  
Time Scale ◽  
Drought Index ◽  
Peninsular Malaysia ◽  
Hydrological Drought ◽  
Mitigation Strategies ◽  
Short Term ◽  
Drought Assessment ◽  
Daily Streamflow ◽  
Drought Characteristics

Abstract. Drought is considered a damaging natural disaster causing significant economic, social, and environmental impacts. The challenge of drought is to determine the characteristics of drought, its frequency, duration, and severity, which are critical for controlling the effects of drought and mitigation strategies. The objective of this study is to identify the drought characteristics and temporal assessment of drought using Streamflow Drought Index (SDI) and theory of runs (ToR). It also highlights the need and methods for selecting the most appropriate time scale for drought assessment, especially in tropical countries. Malaysia experiences tropical weather and monsoon seasons throughout the year with typically humid temperatures ranging from 20 °C to 30 °C. The different spatial patterns of SDI for three-, six-, nine-, and 12-month were adopted throughout Peninsular Malaysia, using 40 years of daily streamflow data from 42 gauging stations. The area under drought stress at different time scales during the study period is stable and accounts for about 24 % of the total area. The years 1997–1999, 2002 and 2016–2018 mark the most critical drought years, when more than 48 % of the total area of the basin was affected by hydrological drought. Spatial evaluation of drought characteristics shows that short-term droughts are common in most regions, with relatively high severity and frequency in the northeast and southeast of Peninsular Malaysia, where the maximum frequency reached 35.7 % and 42.8 %, respectively. The shortest scale (3-month) recorded more mild and moderate events. Since the most extensive time scale (12-month) includes more dry and wet periods, its high value may lead to misleading information for the early warning system. Using the results of this multi-scale SDI analysis, hydrologists, water managers, and policy makers can better understand the time scale selected for hydrological drought analysis. Short-term drought conditions show high interannual variability with the predominant pattern. It was shown that among the SDI time scales, the SDI for 3-month is the most suitable for effectively tracking hydrological droughts in tropical regions.

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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