Spatio-temporal variations in meteorology drought over the Mekong River Delta of Vietnam in the recent decades

Lee, Seung Kyu; Dang, Thanhtrung

doi:10.1007/s10333-018-0681-8

Cited by 29 publications

(29 citation statements)

References 28 publications

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“…The study area is dominated by a tropical monsoon circulation, with two major monsoon seasons, the northeast and southwest, that alternately blow throughout the year [Food and Agriculture Organization (FAO), 2016; Lee and Dang, 2019a…”

Section: Materials and Methods 21 Study Areamentioning

confidence: 99%

Extreme rainfall trends over the Mekong Delta under the impacts of climate change

Lee

Dang

2020

IJCCSM

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Purpose This study aims to investigate aspects related to the changing trends of the rainfall extremes in the entire Mekong Delta in the period of 32 years (1984-2015) applying rainfall extreme indices. First, the homogeneity tests were applied to assess the quality of observed rainfall data series. The authors, then, investigated three rainfall indices including the number of very heavy rainfall days 20 mm (R20), number of days above 50 mm (R50) and number of days above 100 mm (R100) applying the Mann-Kendall test and Sen’s slope estimate. Design/methodology/approach First, the homogeneity tests were applied to assess the quality of observed rainfall data series. The authors, then, investigated three rainfall indices including the number of very heavy rainfall days 20 mm (R20), number of days above 50 mm (R50) and number of days above 100 mm (R100) applying the Mann-Kendall test and Sen’s slope estimate. Findings The results of R20 pointed out that an insignificant upward tendency was found in the coastal provinces, whereas an insignificant downward tendency was also recorded in the inland provinces. Regarding the number of R50, a similar trend to R20 was recorded with five stations slightly increased and five stations slightly decreased. For the number of R100, the results recorded an absence of significant trends over the entire study area. Approximately 58.5% of stations show a slightly decreasing trend, while 41.5% of the remaining stations recorded a slightly increasing trend. Originality/value For the number of R100, the results recorded an absence of the significant trends over the entire study area. Approximately 58.5% of stations show a slightly decreasing trend, while 41.5% of the remaining stations recorded a slightly increasing trend. Of note is the fact that the number of R100 occurred more frequently in the northern provinces, which means the northern region is facing a high risk of flooding.

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Section: Materials and Methods 21 Study Areamentioning

confidence: 99%

Extreme rainfall trends over the Mekong Delta under the impacts of climate change

Lee

Dang

2020

IJCCSM

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“…Long Xuyen Quadrilateral lies in the northwestern of Mekong Delta (09°57'-10°42' N, 104°29'-105°29' E) ( Figure 1). Long Xuyen Quadrilateral is one of the two major deltas in the Mekong Delta, with a total of 490 000 ha area for agriculture belonging to a part of An Giang, Kien Giang and Can Tho Provinces (Vu et al, 2018;Lee and Dang, 2019c). Yearly, this delta region provides up to 4.9 million tons of rice (Oryza sativa L.), resulting in abundant irrigation water and soil rich in nutrients (Kontgis et al, 2019;Lee and Dang, 2019a).…”

Section: Study Areamentioning

confidence: 99%

“…It highly concentrates in the western and southern subregions (Tan Hiep, Ha Tien, Kien Luong and Rach Gia), with values up to 2000 mm yr -1 , while eastern and northern subregions (Chau Doc, Tri Ton, Xuan To and Long Xuyen) receive only approximately 1400 mm yr -1 (Table 1). According to Lee and Dang (2019c), for the three last decades, a significant change in precipitation has been recorded in the Long Xuyen Quadrilateral. Specifically, a slight upward trend in annual precipitation is recorded in the eastern and northern sub-regions, whereas a significant downward trend is found in the western and southern sub-regions, and this may be negatively impacted, leading to drought and flooding in the Long Xuyen Quadrilateral (Lee and Dang, 2019a;Kontgis et al, 2019).…”

Section: Study Areamentioning

confidence: 99%

“…In recent years, precipitation has strongly varied in many areas of the world (MNRE, 2016;Lee and Dang, 2019c), resulting in drought often appear in the dry season, flooding occur in the wet season (Asia Pacific Network, 2010;MNRE, 2016), and off-season precipitation leading to rice crop failure (Asia Pacific Network, 2010; Lee and Dang, 2020). Kotir (2011) stated that the potential risks for agriculture sector under the impacts of climate change (ICC) are attracting the attention of mankind in the 21 st century.…”

Section: Introductionmentioning

confidence: 99%

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Shifting crop planting calendar as a climate change adaptation solution for rice cultivation region in the Long Xuyen Quadrilateral of Vietnam

2020

Chil. j. agric. res.

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Rice (Oryza sativa L.) paddies in the Long Xuyen Quadrilateral Region of Vietnam have regularly met the increased risks under the impacts of climate change (ICC), resulting in a decline in crop productivity. The objective of this study was to determine the suitable times for broadcasting rice crops in the rice cultivation paddies belonging to Long Xuyen Quadrilateral as a mitigation solution to the negative ICC. To conduct this research, crop model namely the FAO-AquaCrop (Version 6.0) was selected to simulate grain yields of rice crops based on different scenarios of crop broadcasting calendar (CBC). The results point out that the grain yield of winter-spring (WS) and summer-autumn (SA) cropping seasons can increase up to 6.2% and 5.3% if the CBC is delayed from 7 to 14 d compared to the current broadcasting calendar (baseline) in the two experimental areas while the grain yield of the autumn-winter (AW) cropping season can increase 6.4% if the CBC is shifted 14 d compared to the baseline. In general, a shift in the CBC for all rice broadcasting crops compared to the baseline can be considered as an effective solution to minimize the negative impacts of weather factors as well as contribute to improve rice productivity.

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“…The catchment is a large supplier of food crops, including glutinous rice, maize and cassava, and much of this is sustained by the irrigation waters. Drought is by far the major hydrological hazard in this region, but large floods are also a problem, especially in the lower reaches and in the delta (Dung et al, 2015, Lee et al, 2018, Smaijgl et al, 2015.…”

Section: The Mekong River Catchmentmentioning

confidence: 99%

Water Quality Modelling of the Mekong River Basin: Climate Change and Socioeconomics Drive Flow and Nutrient Flux Changes to the Mekong Delta

Jin¹

2019

Geological Society of America Abstracts With Programs

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The Mekong delta is recognised as one of the world's most vulnerable mega-deltas, being subject to a range of environmental pressures including sea level rise, increasing population, and changes in flows and nutrients from its upland catchment. With changing climate and socioeconomics there is a need to assess how the Mekong catchment will be affected in terms of the delivery of water and nutrients into the delta system. Here we apply the Integrated Catchment model (INCA) to the whole Mekong River Basin to simulate flow and water quality, including nitrate, ammonia, total phosphorus and soluble reactive phosphorus. The impacts of climate change on all these variables have been assessed across 24 river reaches ranging from the Himalayas down to the delta in Vietnam. We used the UK Met Office PRECIS regionally coupled climate model to downscale precipitation and temperature to the Mekong catchment. This was accomplished using the Global Circulation Model GFDL-CM to provide the boundary conditions under two carbon control strategies, namely representative concentration pathways (RCP) 4.5 and a RCP 8.5 scenario. The RCP 4.5 scenario represents the carbon strategy required to meet the Paris Accord, which aims to limit peak global temperatures to below a 2 o C rise while seeking to pursue options that limit temperature rise to 1.5 o C. The RCP 8.5 scenario is associated with a larger 3-4 o C rise. In addition, we also constructed a range of socioeconomic scenarios to investigate the potential impacts of changing population, atmospheric pollution, economic growth and land use change up to the 2050s. Results of INCA simulations indicate increases in mean flows of up to 24%, with flood flows in the monsoon period increasing by up to 27%, but with increasing periods of drought up to 2050. A shift in the timing of the monsoon is also simulated, with a 4 week advance in the onset of monsoon flows on average. Decreases in nitrogen and phosphorus concentrations occur primarily due to flow dilution, but fluxes of these nutrients also increase by 5%, which reflects the changing flow, land use change and population changes.

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Spatio-temporal variations in meteorology drought over the Mekong River Delta of Vietnam in the recent decades

Cited by 29 publications

References 28 publications

Extreme rainfall trends over the Mekong Delta under the impacts of climate change

Extreme rainfall trends over the Mekong Delta under the impacts of climate change

Shifting crop planting calendar as a climate change adaptation solution for rice cultivation region in the Long Xuyen Quadrilateral of Vietnam

Water Quality Modelling of the Mekong River Basin: Climate Change and Socioeconomics Drive Flow and Nutrient Flux Changes to the Mekong Delta

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