Article
Multidisciplinary Sciences
Changhong Liu, Cuiping Yang, Qi Yang, Jiao Wang
Summary: Drought in Sichuan Province shows differences in characteristics between different physiognomy types, with increasing intensity in the western region mainly concentrated in the Sichuan basin. Altitude is not the main factor causing spatial unevenness of precipitation in Sichuan Province, as altitude, temperature, longitude, and latitude jointly determine precipitation distribution.
SCIENTIFIC REPORTS
(2021)
Article
Geosciences, Multidisciplinary
Tugrul Varol, Ayhan Atesoglu, Halil Baris Ozel, Mehmet Cetin
Summary: Drought, a significant threat to social life, is examined and analyzed by its types, and it is crucial for decision-makers to have advanced methods for monitoring and assessing drought. Multivariate drought indices were developed to overcome the limitations of current methods and accurately determine the level of drought. In a specific region with different characteristics, MSDI was modeled based on SPEI and SRI data, showing acceptable performance in estimating drought across multiple perspectives and time scales.
Article
Environmental Sciences
Nirmal M. Dahal, Xiong Donghong, Nilhari Neupane, Belayneh Yigez, Zhang Baojun, Yuan Yong, Saroj Koirala, Liu Lin, Fang Yiping
Summary: This study analyzed the spatial and temporal characteristics of drought trends in the Koshi River Basin in Nepal from 1987 to 2017, using the standardized precipitation evapotranspiration index (SPEI). It was found that there has been an increasing trend in annual and seasonal drought in the region, particularly in the hill and mountain areas during summer and winter. Additionally, the duration, intensity, and severity of drought events have increased in the KRB after 2000.
JOURNAL OF ARID LAND
(2021)
Article
Engineering, Civil
K. L. Chong, Y. F. Huang, C. H. Koo, Ali Najah Ahmed, Ahmed El-Shafie
Summary: Statistical drought characterization is crucial for drought studies, and efficient drought management can enhance preparedness and risk management. This study analyzed meteorological drought trends and periodicities in Sabah and Sarawak, Malaysia using Standardized Precipitation Indices, identifying declining tendencies and dominant periodicities. Wavelet coherence analysis revealed intermittent coherence between SPI and climatic indices.
JOURNAL OF HYDROLOGY
(2022)
Article
Engineering, Civil
Yaping Wang, Shuai Wang, Wenwu Zhao, Yanxu Liu
Summary: Under global warming, droughts have become more severe and frequent. This study focuses on the Yellow River basin in China, which is mainly located in arid and semi-arid regions and suffers from severe droughts. The study examines the temporal and spatial patterns of droughts in the area and explores the relative effects of water supply (precipitation) and demand (evapotranspiration) on drought occurrence. The study finds that precipitation is the dominant driver of drought occurrence in most of the basin, while evapotranspiration has a greater contribution to drought variations in some areas. The study also highlights the relationship between droughts and ocean signals such as ENSO and NAO.
JOURNAL OF HYDROLOGY
(2022)
Article
Green & Sustainable Science & Technology
Ismallianto Isia, Tony Hadibarata, Muhammad Noor Hazwan Jusoh, Rajib Kumar Bhattacharjya, Noor Fifinatasha Shahedan, Aissa Bouaissi, Norma Latif Fitriyani, Muhammad Syafrudin
Summary: Drought analysis using SPI and SPEI is crucial for water resource management in Sarawak, Malaysia. Both rainfall and temperature are important indicators for drought, and the SPI and SPEI can effectively detect temporal variations of drought with different time scales. The SPEI, considering both precipitation and evapotranspiration data, can identify more severe and longer-lasting droughts compared to the SPI. Temperature plays a decisive role in drought classification, and the SPI is recommended only when temperature data is unavailable.
Article
Engineering, Civil
L. Vergni, A. Vinci, F. Todisco
Summary: This study tested and compared several standardized meteorological indices in identifying agricultural drought impacts in central Italy, with SDDI and SPEI showing slightly better performance and potential in assessing drought impacts.
JOURNAL OF HYDROLOGY
(2021)
Article
Meteorology & Atmospheric Sciences
Cahit Yerdelen, Mohamed Abdelkader, Ebru Eris
Summary: This study utilized continuous wavelet transforms to analyze precipitation data from 15 stations in the Gediz Basin of Turkey, identifying short and long-term drought cycles, and determining key change points through graphical methods and Pettitt's test. The most dominant periodicities affecting the trend were found to be between 24 and 48 months for short-term drought cycles and between 96 and 162 months for long-term drought cycles.
ATMOSPHERIC RESEARCH
(2021)
Article
Environmental Sciences
Hongfei Wei, Xiuguo Liu, Weihua Hua, Wei Zhang, Chenjia Ji, Songjie Han
Summary: This study proposes a standardized comprehensive drought index (SCDI) using the joint distribution of C-vine copula to effectively combine three critical drought factors: precipitation, NDVI, and runoff. The SCDI is found to be a highly reliable and applicable drought index, with a high consistency rate and low false negative rate. The index also shows sensitivity to the time lag effect of NDVI and can assist in monitoring drought patterns in the Yangtze River Basin.
Article
Green & Sustainable Science & Technology
Nur Mohamed Muse, Gokmen Tayfur, Mir Jafar Sadegh Safari
Summary: Drought assessment and trend analysis of precipitation and temperature time series in Somalia's northern region over the past 41 years show that extended drought periods have exacerbated the humanitarian situation. The log-SPI, DPI, and DI methods accurately capture historical extreme and severe drought periods and are recommended as annual drought assessment tools. The trend analysis reveals an overall warming trend and significant positive trends in precipitation at Bossaso and Garowe stations.
Article
Green & Sustainable Science & Technology
Jiwei Sun, Shuoben Bi, Bashar Bashir, Zhangxi Ge, Kexin Wu, Abdullah Alsalman, Brian Odhiambo Ayugi, Karam Alsafadi
Summary: Against the backdrop of global climate change, this study examines the dynamics of drought characteristics in China from 1951 to 2020. Precipitation data from 700 meteorological stations were analyzed using SPI-12 and SPEI-12 to detect drought characteristics. The findings reveal that drought-prone areas in China are expanding, with the most severe drought event occurring in 2010-2011. The frequency of drought occurrence gradually decreases from south to north, but areas with less frequent droughts experience longer and more severe drought durations.
Article
Environmental Sciences
Fadoua El Qorchi, Mohammed Yacoubi Khebiza, Onyango Augustine Omondi, Ahmed Karmaoui, Quoc Bao Pham, Siham Acharki
Summary: This study analyzes the main characteristics and historical drought trend in the Upper Draa Basin using the SPI, SPEI, Run Theory, and Mann-Kendall Trend Test. The results show significant variation in rainfall across different regions and years, with higher rainfall in areas of higher altitude. Drought frequency is relatively low but severe droughts have occurred in certain years.
Article
Geosciences, Multidisciplinary
Tazen Fowe, Roland Yonaba, Lawani Adjadi Mounirou, Etienne Ouedraogo, Boubacar Ibrahim, Dial Niang, Harouna Karambiri, Hamma Yacouba
Summary: This study aims to investigate the relationships between meteorological and hydrological droughts in the Nakanbe River basin upstream Wayen hydrometric station (NRUW) in Burkina Faso. The results indicate distinct categories of droughts occurring at different time scales, and the relationships between the two types of droughts are crucial for effective monitoring and prediction of hydrological drought events.
Article
Engineering, Civil
Ihsan F. Hasan, Rozi Abdullah
Summary: In this study, the Standardized Effective Precipitation Index (SEPI) derived from the Standardized Precipitation Index (SPI) methodology was used to identify agricultural drought frequency in northern Iraq. The copula methodology was adopted to analyze the bivariate frequency of drought severity and duration. Three Archimedean copulas were compared to select the most suitable model. The results showed that the Generalized Pareto and Lognormal distributions were the best for drought duration and severity, and the Gumbel copula was the most suitable for joint modeling. The novelty of this study lies in the use of meteorological variables (effective precipitation) in the copula analysis of agricultural drought characteristics. SEPI can be used to overcome the limitations of soil moisture data availability.
WATER RESOURCES MANAGEMENT
(2022)
Article
Geosciences, Multidisciplinary
Anwar Hussain, Khan Zaib Jadoon, Khalil Ur Rahman, Songhao Shang, Muhammad Shahid, Nuaman Ejaz, Himayatullah Khan
Summary: This study evaluates the impact of drought on Pakistan's agriculture sector at national and provincial scales. The results show that Punjab, Balochistan, and Sindh provinces are most vulnerable to drought, and the decrease in drought severity has a positive impact on maize, sugarcane, tobacco, and wheat yields.