Spatio-temporal Trend Analysis Of Hydro-climatic Variables Of The Northern Region In Sri Lanka

In recent decades, Sri Lanka has experienced severe floods and droughts, causing health issues and agricultural and income losses. This study evaluated the Spatio-temporal trend of historical and future hydro-climatic variables in the northern region of Sri Lanka. Overall, northern Sri Lanka faced a...

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Main Author:	Nagamuthu, Piratheeparajah
Format:	Thesis
Language:	English
Published:	2022
Subjects:	P1-1091 Philology Linguistics(General)
Online Access:	http://eprints.usm.my/59877/1/PIRATHEEPARAJAH%20NAGAMUTHU%20-%20TESIS24.pdf
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id	my-usm-ep.59877
record_format	uketd_dc
spelling	my-usm-ep.598772024-02-14T07:01:27Z Spatio-temporal Trend Analysis Of Hydro-climatic Variables Of The Northern Region In Sri Lanka 2022-05 Nagamuthu, Piratheeparajah P1-1091 Philology. Linguistics(General) In recent decades, Sri Lanka has experienced severe floods and droughts, causing health issues and agricultural and income losses. This study evaluated the Spatio-temporal trend of historical and future hydro-climatic variables in the northern region of Sri Lanka. Overall, northern Sri Lanka faced an increase in drought severity during the southwest monsoon season but increased flood severity during the northeast. The trend analysis shows that temperature, precipitation, and evaporation from 1970 to 2019 have increased by 0.44 °C /decade, 18.76mm/decade to 37.68 mm/decade, and evaporation increased by 17%, respectively. More than 50% of the total rainfall is recorded within two weeks, especially from the 20th of November to the 05th of December every year. In the 2020-2100 period, precipitation and temperature are projected to increase by 1.13°C (1.81°C) and 106.19 mm (186mm) under the RCP4.5 (8.5) scenario, respectively as compared to the baseline from 1970 to 2019. There is a strong negative correlation between the reduced number of rainy days and the runoff volume, with an R-value of - 0.70; this indicates and confirms that reduction of rainy days increased the runoff in this region due to the high intensity of the rainfall within a short period. The water availability of the reservoirs significantly dropped during the latter part of the first inter monsoon season, leading to the impact on water supply and demand in the study area. Spatially compared to other parts, the temperature of the western region of the study area has been increasing rapidly by 0.04°C and the middle part of the study area is experiencing an increasing pattern of 9mm rainfall more than other areas. 2022-05 Thesis http://eprints.usm.my/59877/ http://eprints.usm.my/59877/1/PIRATHEEPARAJAH%20NAGAMUTHU%20-%20TESIS24.pdf application/pdf en public phd doctoral Universiti Sains Malaysia Pusat Pengajian Ilmu Kemanusiaan
institution	Universiti Sains Malaysia
collection	USM Institutional Repository
language	English
topic	P1-1091 Philology Linguistics(General)
spellingShingle	P1-1091 Philology Linguistics(General) Nagamuthu, Piratheeparajah Spatio-temporal Trend Analysis Of Hydro-climatic Variables Of The Northern Region In Sri Lanka
description	In recent decades, Sri Lanka has experienced severe floods and droughts, causing health issues and agricultural and income losses. This study evaluated the Spatio-temporal trend of historical and future hydro-climatic variables in the northern region of Sri Lanka. Overall, northern Sri Lanka faced an increase in drought severity during the southwest monsoon season but increased flood severity during the northeast. The trend analysis shows that temperature, precipitation, and evaporation from 1970 to 2019 have increased by 0.44 °C /decade, 18.76mm/decade to 37.68 mm/decade, and evaporation increased by 17%, respectively. More than 50% of the total rainfall is recorded within two weeks, especially from the 20th of November to the 05th of December every year. In the 2020-2100 period, precipitation and temperature are projected to increase by 1.13°C (1.81°C) and 106.19 mm (186mm) under the RCP4.5 (8.5) scenario, respectively as compared to the baseline from 1970 to 2019. There is a strong negative correlation between the reduced number of rainy days and the runoff volume, with an R-value of - 0.70; this indicates and confirms that reduction of rainy days increased the runoff in this region due to the high intensity of the rainfall within a short period. The water availability of the reservoirs significantly dropped during the latter part of the first inter monsoon season, leading to the impact on water supply and demand in the study area. Spatially compared to other parts, the temperature of the western region of the study area has been increasing rapidly by 0.04°C and the middle part of the study area is experiencing an increasing pattern of 9mm rainfall more than other areas.
format	Thesis
qualification_name	Doctor of Philosophy (PhD.)
qualification_level	Doctorate
author	Nagamuthu, Piratheeparajah
author_facet	Nagamuthu, Piratheeparajah
author_sort	Nagamuthu, Piratheeparajah
title	Spatio-temporal Trend Analysis Of Hydro-climatic Variables Of The Northern Region In Sri Lanka
title_short	Spatio-temporal Trend Analysis Of Hydro-climatic Variables Of The Northern Region In Sri Lanka
title_full	Spatio-temporal Trend Analysis Of Hydro-climatic Variables Of The Northern Region In Sri Lanka
title_fullStr	Spatio-temporal Trend Analysis Of Hydro-climatic Variables Of The Northern Region In Sri Lanka
title_full_unstemmed	Spatio-temporal Trend Analysis Of Hydro-climatic Variables Of The Northern Region In Sri Lanka
title_sort	spatio-temporal trend analysis of hydro-climatic variables of the northern region in sri lanka
granting_institution	Universiti Sains Malaysia
granting_department	Pusat Pengajian Ilmu Kemanusiaan
publishDate	2022
url	http://eprints.usm.my/59877/1/PIRATHEEPARAJAH%20NAGAMUTHU%20-%20TESIS24.pdf
_version_	1794024067003580416

Spatio-temporal Trend Analysis Of Hydro-climatic Variables Of The Northern Region In Sri Lanka

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