Interpretation Physical Meaning Of Meteorological Drought Indicators: A Case Study In Ping River Basin Thailand
This study aims to explore relationships between drought indicator values and real drought situations as ground truth information in order that such drought indicators can be used appropriately for drought warnings as well as for mitigation measures. Ping river basin, situated in the northern region...
| Main Authors: | , , |
|---|---|
| Format: | Article |
| Language: | English |
| Published: |
Tamkang University Press
2023-02-01
|
| Series: | Journal of Applied Science and Engineering |
| Subjects: | |
| Online Access: | http://jase.tku.edu.tw/articles/jase-202309-26-9-0008 |
| _version_ | 1811169776630759424 |
|---|---|
| author | Uruya Weesakul Narongrit Luangdilok Suraparb Keawsawasvong |
| author_facet | Uruya Weesakul Narongrit Luangdilok Suraparb Keawsawasvong |
| author_sort | Uruya Weesakul |
| collection | DOAJ |
| description | This study aims to explore relationships between drought indicator values and real drought situations as ground truth information in order that such drought indicators can be used appropriately for drought warnings as well as for mitigation measures. Ping river basin, situated in the northern region of Thailand was selected as a case study due to its frequent drought phenomena. Amongst various drought indicators, Standardized Precipitation Index (SPI) and Decile (DR) were selected as drought indicators due to their simplicity in calculation and availability of data. Five rainfall stations, distributed over the Ping river basin, with monthly rainfall data from 1975 to 2018 were selected for the study. SPI and DR were computed into 3 types which are annual SPI and DR, monsoon SPI and DR (SPI6, DR6) using accumulated rainfall from April to September, and pre-monsoon SPI and DR (SPI3 and DR3), using accumulated rainfall from January to March. Investigation of computed
drought indicators and drought ground truth information revealed that annual SPI, as well as monsoon DR, agreed well with drought ground truth when criteria of drought were shifted to be above normal standard criteria. In the other words, using standard drought classification of SPI and DR provided agreement with ground truth of around 68%, while using calibrated criteria agreement with ground truth increased by 78%, for both drought indicators. It is therefore recommended to understand the physical meaning of digital values of drought indicators before using them for drought mitigation measures. |
| first_indexed | 2024-04-10T16:47:18Z |
| format | Article |
| id | doaj.art-194af2c001804cddad396b73e3436b3a |
| institution | Directory Open Access Journal |
| issn | 2708-9967 2708-9975 |
| language | English |
| last_indexed | 2024-04-10T16:47:18Z |
| publishDate | 2023-02-01 |
| publisher | Tamkang University Press |
| record_format | Article |
| series | Journal of Applied Science and Engineering |
| spelling | doaj.art-194af2c001804cddad396b73e3436b3a2023-02-07T19:56:09ZengTamkang University PressJournal of Applied Science and Engineering2708-99672708-99752023-02-012691273128510.6180/jase.202309_26(9).0008Interpretation Physical Meaning Of Meteorological Drought Indicators: A Case Study In Ping River Basin ThailandUruya Weesakul0Narongrit Luangdilok1Suraparb Keawsawasvong2Department of Civil Engineering, Faculty of Engineering, Thammasat School of Engineering, Thammasat University, PathumThani 12120, ThailandHydro-Informatics Institute, Bangkok 10990, ThailandDepartment of Civil Engineering, Faculty of Engineering, Thammasat School of Engineering, Thammasat University, PathumThani 12120, ThailandThis study aims to explore relationships between drought indicator values and real drought situations as ground truth information in order that such drought indicators can be used appropriately for drought warnings as well as for mitigation measures. Ping river basin, situated in the northern region of Thailand was selected as a case study due to its frequent drought phenomena. Amongst various drought indicators, Standardized Precipitation Index (SPI) and Decile (DR) were selected as drought indicators due to their simplicity in calculation and availability of data. Five rainfall stations, distributed over the Ping river basin, with monthly rainfall data from 1975 to 2018 were selected for the study. SPI and DR were computed into 3 types which are annual SPI and DR, monsoon SPI and DR (SPI6, DR6) using accumulated rainfall from April to September, and pre-monsoon SPI and DR (SPI3 and DR3), using accumulated rainfall from January to March. Investigation of computed drought indicators and drought ground truth information revealed that annual SPI, as well as monsoon DR, agreed well with drought ground truth when criteria of drought were shifted to be above normal standard criteria. In the other words, using standard drought classification of SPI and DR provided agreement with ground truth of around 68%, while using calibrated criteria agreement with ground truth increased by 78%, for both drought indicators. It is therefore recommended to understand the physical meaning of digital values of drought indicators before using them for drought mitigation measures.http://jase.tku.edu.tw/articles/jase-202309-26-9-0008drought indicatorsstandardized precipitation indexdecile methodping river basinthailand |
| spellingShingle | Uruya Weesakul Narongrit Luangdilok Suraparb Keawsawasvong Interpretation Physical Meaning Of Meteorological Drought Indicators: A Case Study In Ping River Basin Thailand Journal of Applied Science and Engineering drought indicators standardized precipitation index decile method ping river basin thailand |
| title | Interpretation Physical Meaning Of Meteorological Drought Indicators: A Case Study In Ping River Basin Thailand |
| title_full | Interpretation Physical Meaning Of Meteorological Drought Indicators: A Case Study In Ping River Basin Thailand |
| title_fullStr | Interpretation Physical Meaning Of Meteorological Drought Indicators: A Case Study In Ping River Basin Thailand |
| title_full_unstemmed | Interpretation Physical Meaning Of Meteorological Drought Indicators: A Case Study In Ping River Basin Thailand |
| title_short | Interpretation Physical Meaning Of Meteorological Drought Indicators: A Case Study In Ping River Basin Thailand |
| title_sort | interpretation physical meaning of meteorological drought indicators a case study in ping river basin thailand |
| topic | drought indicators standardized precipitation index decile method ping river basin thailand |
| url | http://jase.tku.edu.tw/articles/jase-202309-26-9-0008 |
| work_keys_str_mv | AT uruyaweesakul interpretationphysicalmeaningofmeteorologicaldroughtindicatorsacasestudyinpingriverbasinthailand AT narongritluangdilok interpretationphysicalmeaningofmeteorologicaldroughtindicatorsacasestudyinpingriverbasinthailand AT suraparbkeawsawasvong interpretationphysicalmeaningofmeteorologicaldroughtindicatorsacasestudyinpingriverbasinthailand |