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Modelling climate change impacts on the seasonality of water resources in the Upper Ca River Watershed in Southeast Asia.

Giang PQ, Toshiki K, Sakata M, Kunikane S, Vinh TQ - ScientificWorldJournal (2014)

Bottom Line: The results indicated that temperature and evapotranspiration will increase in all months of future years.The greatest monthly increase of up to 29% and the greatest monthly decrease of up to 30% are expected in the 2090 s.As a result, decreases in dry season discharge and increases in wet season discharge are expected, with a span of ± 25% for the highest monthly changes in the 2090 s.

View Article: PubMed Central - PubMed

Affiliation: Department of Environmental and Life Sciences, University of Shizuoka, 52-1 Yada, Suruga-ku, Shizuoka-shi, Shizuoka 422-8526, Japan ; Faculty of Land Management, Vietnam National University of Agriculture, Hanoi 131000, Vietnam.

ABSTRACT
The impact of climate change on the seasonality of water resources in the Upper Ca River Watershed in mainland Southeast Asia was assessed using downscaled global climate models coupled with the SWAT model. The results indicated that temperature and evapotranspiration will increase in all months of future years. The area could warm as much as 3.4(°)C in the 2090 s, with an increase of annual evapotranspiration of up to 23% in the same period. We found an increase in the seasonality of precipitation (both an increase in the wet season and a decrease in the dry season). The greatest monthly increase of up to 29% and the greatest monthly decrease of up to 30% are expected in the 2090 s. As a result, decreases in dry season discharge and increases in wet season discharge are expected, with a span of ± 25% for the highest monthly changes in the 2090 s. This is expected to exacerbate the problem of seasonally uneven distribution of water resources: a large volume of water in the wet season and a scarcity of water in the dry season, a pattern that indicates the possibility of more frequent floods in the wet season and droughts in the dry season.

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Related in: MedlinePlus

Geographic location of the entire Ca River Watershed (left) and the UCRW (right).
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Related In: Results  -  Collection


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fig1: Geographic location of the entire Ca River Watershed (left) and the UCRW (right).

Mentions: The Ca River originates in the Loi Mountains of Laos, crosses Laos PDR's Xiangkhouang Province, flows into Vietnam and through the province of Nghe An, and joins the La River before emptying into the Gulf of Tonkin at the Cua Hoi estuary. The river flows in a northwest to southeast direction and has a total length of more than 350 km, of which approximately 100 km is within the territory of Laos and 250 km is within Vietnam. The upper part of the Ca River Watershed (hereafter, the Upper Ca River Watershed—UCRW) defined in this study is the area of the watershed which has its outlet at Yen Thuong hydrological station (105°23′E, 18°41′N) in Nghe An Province (Vietnam) and covers an area of approximately 22,800 km2 of a total watershed size of 27,200 km2. Geographic location and detailed information about the UCRW are shown in Figure 1.


Modelling climate change impacts on the seasonality of water resources in the Upper Ca River Watershed in Southeast Asia.

Giang PQ, Toshiki K, Sakata M, Kunikane S, Vinh TQ - ScientificWorldJournal (2014)

Geographic location of the entire Ca River Watershed (left) and the UCRW (right).
© Copyright Policy - open-access
Related In: Results  -  Collection

Show All Figures
getmorefigures.php?uid=PMC4150503&req=5

fig1: Geographic location of the entire Ca River Watershed (left) and the UCRW (right).
Mentions: The Ca River originates in the Loi Mountains of Laos, crosses Laos PDR's Xiangkhouang Province, flows into Vietnam and through the province of Nghe An, and joins the La River before emptying into the Gulf of Tonkin at the Cua Hoi estuary. The river flows in a northwest to southeast direction and has a total length of more than 350 km, of which approximately 100 km is within the territory of Laos and 250 km is within Vietnam. The upper part of the Ca River Watershed (hereafter, the Upper Ca River Watershed—UCRW) defined in this study is the area of the watershed which has its outlet at Yen Thuong hydrological station (105°23′E, 18°41′N) in Nghe An Province (Vietnam) and covers an area of approximately 22,800 km2 of a total watershed size of 27,200 km2. Geographic location and detailed information about the UCRW are shown in Figure 1.

Bottom Line: The results indicated that temperature and evapotranspiration will increase in all months of future years.The greatest monthly increase of up to 29% and the greatest monthly decrease of up to 30% are expected in the 2090 s.As a result, decreases in dry season discharge and increases in wet season discharge are expected, with a span of ± 25% for the highest monthly changes in the 2090 s.

View Article: PubMed Central - PubMed

Affiliation: Department of Environmental and Life Sciences, University of Shizuoka, 52-1 Yada, Suruga-ku, Shizuoka-shi, Shizuoka 422-8526, Japan ; Faculty of Land Management, Vietnam National University of Agriculture, Hanoi 131000, Vietnam.

ABSTRACT
The impact of climate change on the seasonality of water resources in the Upper Ca River Watershed in mainland Southeast Asia was assessed using downscaled global climate models coupled with the SWAT model. The results indicated that temperature and evapotranspiration will increase in all months of future years. The area could warm as much as 3.4(°)C in the 2090 s, with an increase of annual evapotranspiration of up to 23% in the same period. We found an increase in the seasonality of precipitation (both an increase in the wet season and a decrease in the dry season). The greatest monthly increase of up to 29% and the greatest monthly decrease of up to 30% are expected in the 2090 s. As a result, decreases in dry season discharge and increases in wet season discharge are expected, with a span of ± 25% for the highest monthly changes in the 2090 s. This is expected to exacerbate the problem of seasonally uneven distribution of water resources: a large volume of water in the wet season and a scarcity of water in the dry season, a pattern that indicates the possibility of more frequent floods in the wet season and droughts in the dry season.

Show MeSH
Related in: MedlinePlus