Adjusting SPI for crop specific agricultural drought

Date

2015-12-01

Author

YILDIRAK, ŞAHAP KASIRGA
Kestel, Sevtap Ayşe

Metadata

Show full item record

This work is licensed under a Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License.

Item Usage Stats

130
views

0
downloads

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 misclassification rate of a multivariate decision model. By maximizing the area under ROC curve, we are able to calibrate thresholds for the realized states of the drought. By multivariate decision problems, crop and location specific information is used to regulate the size of the classes so that they can reveal agricultural wise meaningful information. Rain-fed wheat monitoring at Polatli station of Turkey is studied for an implementation.

Subject Keywords

Agricultural drought monitoring, CART, Receiver operating characteristics curve, Standardized precipitation index

URI

https://hdl.handle.net/11511/30036

Journal

ENVIRONMENTAL AND ECOLOGICAL STATISTICS

DOI

https://doi.org/10.1007/s10651-015-0326-7

Collections

Graduate School of Applied Mathematics, Article

Suggestions

OpenMETU
Core

ASSESSING DROUGHT BY STANDARDIZED PRECIPITATION INDEX WITH OBSERVATION AND CORDEX DATA IN TURKEY’S MEDITERRANEAN REGION Poyraz, Anıl; Yücel, İsmail (2018-06-02) 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 equival...
Risk-based reservoir operation under drought conditions Türkeri, Mustafa Kemal; Akyürek, Sevda Zuhal; Department of Civil Engineering (2019) This study introduces a practical drought risk assessment methodology for reservoirs and hydraulic structures, which can be used in basin drought risk management. Reservoir operation study is used as a main tool in the risk assessment methodology. The methodology developed in this study contains a probabilistic deficiency analysis approach for reservoir inflows. Different scenarios are developed which include hydrological deficiencies for various return periods. Developed scenarios are also modified for cli...
Validation of TMPA and ECMWF Precipitation Estimates Using Gauge Based Observations over West Azarbayjan province of Iran Hesamı Afshar, Mehdı; Amjad, Muhammad; Bulut, Burak; Düzenli, Eren; Patakchi Yousufi, Kaveh; Yılmaz, Mustafa Tuğrul (2019-11-13) Uncertainty estimation of precipitation products estimated from different platforms are essential for many hydrological and agricultural applications that use these datasets. Among the precipitation retrieval products satellite- and model-based estimates have the advantage of providing consistent and continuous precipitation records. This study evaluates a satellite-based product (TMPA 3B42V7) and a model-based product (ECMWF 1 daily deterministic forecast) by using 16 ground-based gauges data as reference ...
A technical feasibility study on the use of Çavundur geothermal field for greenhouse heating Kasapoğlu, Hüseyin; Parlaktuna, Mahmut; Department of Petroleum and Natural Gas Engineering (2003) Protective cultivation is widely used nowadays in order to increase crop yield by creating the optimum conditions such as temperature, humidity and CO2 content, irrespective of outside conditions. Since plant production doubles for every 10 degrees increase in temperature to a certain limit, this makes temperature a very important factor for optimum plant growth. In order to keep the greenhouse temperature constant during changes in outside conditions, heating and often cooling are required. Heating of a gr...
Investigation of the dependence of satellite-based precipitation estimate errors to distance from the coastline Uydu Kaynakli Yaǧmur Verilerinin Hata Oranlarinin Deniz Kiyilarina Olan Uzakliǧa Baǧli Analizi YILMAZ, MERİÇ; Amjad, Muhammad; Bulut, Burak; Yılmaz, Mustafa Tuğrul (2017-01-01) In this study, Tropical Rainfall Measuring Mission (TRMM) 3B42 v7 satellite based rainfall data are verified by using cumulative monthly rainfall data measured at 257 stations operated by the General Directorate of Meteorology between 1998 and 2014. Long-term mean values of station-based and satellite-based rainfall data, correlation between them, Standard deviation of monthly average and anomaly components, and standard deviation of satellite based data error are analyzed. Variation of satellite-based data...

Citation Formats

Ş. K. YILDIRAK and S. A. Kestel, “Adjusting SPI for crop specific agricultural drought,” ENVIRONMENTAL AND ECOLOGICAL STATISTICS, pp. 681–691, 2015, Accessed: 00, 2020. [Online]. Available: https://hdl.handle.net/11511/30036.