Show/Hide Menu
Hide/Show Apps
Logout
Türkçe
Türkçe
Search
Search
Login
Login
OpenMETU
OpenMETU
About
About
Open Science Policy
Open Science Policy
Open Access Guideline
Open Access Guideline
Postgraduate Thesis Guideline
Postgraduate Thesis Guideline
Communities & Collections
Communities & Collections
Help
Help
Frequently Asked Questions
Frequently Asked Questions
Guides
Guides
Thesis submission
Thesis submission
MS without thesis term project submission
MS without thesis term project submission
Publication submission with DOI
Publication submission with DOI
Publication submission
Publication submission
Supporting Information
Supporting Information
General Information
General Information
Copyright, Embargo and License
Copyright, Embargo and License
Contact us
Contact us
ASSESSING DROUGHT BY STANDARDIZED PRECIPITATION INDEX WITH OBSERVATION AND CORDEX DATA IN TURKEY’S MEDITERRANEAN REGION
Date
2018-06-02
Author
Poyraz, Anıl
Yücel, İsmail
Metadata
Show full item record
Item Usage Stats
269
views
0
downloads
Cite This
This study aims to assess the trends in drought by using the Standardized Precipitation Index(SPI) for 14 stations from Mediterranean climate region of Turkey. The SPI values for different timescales - from 1month to 1 year - are estimated for past and future by using the observed, uncorrected and bias corrected model data. The model data that correspond the grids which consist these 14 stations was obtained from 12 different climate models on CORDEX project. Bias correction method was applied using equivalent quantile method(EQM) for both historical (1971-2005) and future (2006-2050) model data. Then, observed and model precipitation data and SPI values were compared in order to select the most reliable models for the region. The root mean square error of SPI and precipitation values was the first statistic to measure the closeness of the models to the observed data. Finally, modified Mann-Kendall trend analysis test was applied on the SPI and precipitation values for the whole period (1971- 2050) for the most reliable models.
Subject Keywords
Drought
,
Standardized precipitation index
,
Trend analysis
URI
https://hdl.handle.net/11511/77005
Collections
Department of Civil Engineering, Conference / Seminar
Suggestions
OpenMETU
Core
Analyses of flood events using regional hydrometeorological modeling system
Önen, Alper; Yücel, İsmail; Department of Civil Engineering (2013)
Extreme rainfall events and consequent floods are being observed more frequently in the Western Black Sea region in Turkey as climate changes. In this study, application of a flood early warning system is intended by using and calibrating a combined model system. A regional-scale hydro-meteorological model system, consisting of Weather Research and Forecasting (WRF) model, NOAH land surface model and fully distributed NOAH-Hydro hydrologic models, is used for simulations of 25 heavy-rainfall and major flood...
Drought analysis using CORDEX simulations over the mediterranean climate regions of Turkey
Poyraz, Anıl Yıldırım; Yücel, İsmail; Department of Civil Engineering (2018)
Drought has been a significant result of climate change that causes variance on precipitation regimes. Mediterranean region is one of the hotspots of the world in this respect. Dry summers and rainy winters -the characteristic of this climate type- makes this region more vulnerable to the effects of climate change. Hence, it is important to monitor drought considering the increasing population and economic facilities in the regions that are under Mediterranean climate conditions in Turkey. This study aims t...
Comparing ecological structure of Turkish shallow lakes between the seasons, and wet & dry years
Çağan, Ali Serhan; Beklioğlu, Meryem; Department of Biology (2015)
Due to global climate change, lakes in Mediterranean climate face the problem of reduced precipitation and enhanced evaporation along with increased water abstraction for irrigation that are largely causing changes in water level, salinity and nutrient dynamics. In this study 22 Turkish shallow lakes were investigated in the Mediterranean climate zone. All lakes were sampled with a well-established snapshot sampling protocol. There are 19 lakes, which were sampled once during both spring and summer seasons ...
Adjusting SPI for crop specific agricultural drought
YILDIRAK, ŞAHAP KASIRGA; Kestel, Sevtap Ayşe (2015-12-01)
Standardized Precipitation Index (SPI) is one of the most used drought monitoring tools. It is easy to compute as it only needs cumulative precipitation amount for an input. However, it is more of a meteorological drought index rather than an agricultural one. In this study, we reconstruct SPI for monitoring a specific crop by calibrating the cut-off values that separates drought classes. For this purpose, two objectives to optimize are obtained: area under receiver operating characteristics (ROC) curve and...
Evaluating and merging model- and satellite-based precipitation products over varying climate and topography
Amjad, Muhamma; Yılmaz, Mustafa Tuğrul; Department of Civil Engineering (2020)
Before using the satellite- and model-based precipitation retrievals in hydrological studies, their uncertainty assessment is crucial. Improving their performance accuracy is another important issue worth consideration. This study first evaluates and intercompares a set of nine precipitation products (2 satellite estimation-based, 2 model reanalysis-based, and 5 model forecast-based products) over varying climate and topography by using the in-situ observed precipitation data as truth. The products were the...
Citation Formats
IEEE
ACM
APA
CHICAGO
MLA
BibTeX
A. Poyraz and İ. Yücel, “ASSESSING DROUGHT BY STANDARDIZED PRECIPITATION INDEX WITH OBSERVATION AND CORDEX DATA IN TURKEY’S MEDITERRANEAN REGION,” 2018, Accessed: 00, 2021. [Online]. Available: https://hdl.handle.net/11511/77005.