Scopus İndeksli Yayınlar Koleksiyonu / Scopus Indexed Publications Collection

Permanent URI for this collectionhttps://hdl.handle.net/11147/7148

Browse

Filters

2023 - 20252

Settings

Author: search.filters.author.Safari, Mir Jafar SadeghDepartment: search.filters.department.İzmir Institute of Technology

Search Results

Now showing 1 - 2 of 2
  • Article
    Developing Feasible Structural Flood Mitigation Measures for Arid Regions Using Hydrological and Hydraulic Modelling: a Case of Baledweyne City, Somalia
    (Springer Int Publ Ag, 2025) Tayfur, Gökmen; Tayfur, Gokmen; Safari, Mir Jafar Sadegh; 03.03. Department of Civil Engineering; 03. Faculty of Engineering; 01. Izmir Institute of Technology
    Flood mitigation measures are essential in several aspects of environmental sustainability, such as environmental protection and development, infrastructure resilience, and climate change adaptation strategies. This study investigates several remedial measures such as flood and disaster risk reduction strategies to protect Baledwayne City, Somalia. The developed hydrological-hydraulic model is successfully calibrated using the 2019 flood event. Inundation maps for different mitigation measures are developed to determine the most appropriate one(s) that may reduce flood impact and protect the city, especially the residential areas, against peak discharge of a 500-year return period. The investigated mitigation measures include (1) operating the Warabole Diversion Canal, (2) building two detention ponds at the upstream sections of both right and left floodplains, (3) building levees (dikes) along both sides of Shabelle River, and (4) restoration of the river. Results show that the remedial measures for the Warabole Diversion Channel and the river restoration are insufficient to protect the city. Building ponds on the right- and left-hand sides of the river substantially protects the city from flooding by reducing the flooded area from 88.6 to 31.5 km2, which is equivalent to a reduction of 35.5%. Construction of dikes on both sides of the river does not protect the city by overflowing an area of 75.2 km2 (84.9%). A combination of several measures is also investigated and it is found that ponds must be built along with any alternative measure. When all four measures are combined, it becomes clear that the city's residential areas would be fully protected, significantly reducing the overall flooded area of the city to 27.9 km2 (31.5%). These flooded areas are behind the detention pond, which is designed to hold floodwater and gradually drain it back to the river.
  • Article
    Citation - WoS: 7
    Citation - Scopus: 8
    A Joint Evaluation of Streamflow Drought and Standard Precipitation Indices in Aegean Region, Turkey
    (SPRINGER BASEL AG, 2023) Gülmez, Ayşe; Tayfur, Gökmen; Vaheddoost, Babak; Safari, Mir Jafar Sadegh; Tayfur, Gokmen; 03.03. Department of Civil Engineering; 03. Faculty of Engineering; 01. Izmir Institute of Technology
    Water is an invaluable substance that ensures the life cycle and causes hydrologic events worldwide. Water deficit, also known as drought, is a naturally occurring disaster that affects the hydrometeorologic and/or climatic responses in time and space. In this study, the meteorologic and hydrologic droughts in Buyuk Menderes, Kucuk Menderes, and Gediz basins in Turkey are investigated. The streamflow drought index (SDI) and standard precipitation index (SPI) are used considering different time windows. To achieve this, the monthly streamflow at Cicekli-Nif, Besdegirmenler-Dandalas, Bebekler-Rahmanlar, and Kocarli-Koprubasi hydrometric stations together with monthly precipitation at 14 meteorologic stations during 1973-2020 (47 years) are used. The SDI and SPI with 1, 3, 6, and 12 months moving average are then used to express the association between the meteorologic and hydrologic droughts in the basin. Results showed that the SDI depicts no abnormal situations, while the SPI rates in the 1980s and 2010s indicated severe droughts. It was concluded that the inner parts of the basins are prone to frequent droughts, and there is a concordance between SPI and SDI patterns at the basin level. However, minor discrepancies between SPI and SDI do exist and probably originated from temporal delays and water abstraction.