Studying Onset and Evolution of Agricultural Drought in Mekong River Basin through Hydrologic Modeling

Palanisamy, Bakkiyalakshmi; Narasimhan, Balaji; Paul, Sabu; Srinivasan, Raghavan; Wangpimool, Winai; Lim, Sopheap; Sayasane, Rattykone

doi:10.3390/w13243622

Cited by 5 publications

(2 citation statements)

References 29 publications

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“…The DRT exhibited a spatiotemporal distribution pattern of shorter in the north and longer in the south. Meanwhile, among the six sub-regions, sub-region III (Korat Plateau) displayed significant spatiotemporal differentiation, which is consistent with previous research [55,85,86]. The results also indicated that the DRT was shorter during the dry season and longer during the rainy season, which was highly consistent with previous studies [41,45,84].…”

Section: Comparison With Previous Researchsupporting

confidence: 91%

Propagation of Meteorological Drought to Agricultural and Hydrological Droughts in the Tropical Lancang–Mekong River Basin

Feng,

Chen,

Mansaray

et al. 2023

Remote Sensing

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In the past several decades, drought events have occurred frequently around the world. However, research on the propagation of drought events has not been adequately explored. This study investigated the drought propagation process from meteorological drought to agricultural drought (PMAD) and from meteorological drought to hydrological drought (PMHD) using a 72-year reanalysis dataset in the tropical Lancang–Mekong River Basin. Firstly, we used a new method—Standardized Drought Analysis Toolbox—to construct drought indices. Then, a linear method (Pearson correlation analysis) and a nonlinear method (mutual information) were used to investigate the drought propagation process. Cross-wavelet analysis and wavelet coherence analysis were employed to explore the statistical relationship among the three drought types. Finally, the random forest method was applied to quantify the major factors in drought response time (DRT). The results revealed the following: (1) both linear and nonlinear methods exhibited strong temporal and spatial consistency for both PMAD and PMHD, with linear relationships being stronger than nonlinear ones. (2) The DRTs of PMAD and PMHD were around 1–2 months and 3–5 months, respectively. Significant differences existed in the DRT between the dry season and the rainy season. (3) A divergent spatial pattern of the proportion of DRT was observed between PMAD and PMHD. (4) Significant statistical correlations between meteorological drought and agricultural drought and between meteorological drought and hydrological drought were observed in specific periods for each sub-region; (5) Hydrometeorological factors contributed the most to DRT, followed by terrain factors and the land cover types. The findings of this study deepened our understanding of the spatial–temporal relationship of multiple drought propagation types in this transboundary river basin.

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Section: Comparison With Previous Researchsupporting

confidence: 91%

Propagation of Meteorological Drought to Agricultural and Hydrological Droughts in the Tropical Lancang–Mekong River Basin

Feng,

Chen,

Mansaray

et al. 2023

Remote Sensing

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“…T A B L E 1 Classification of meteorological, agricultural (Palanisamy et al, 2021), and streamflow deficit indices.…”

Section: Derivation Of Precipitation Soil Moisture and Streamflow Def...mentioning

confidence: 99%

Development and propagation of hydrologic drought from meteorological and agricultural drought in the Mekong River Basin

Palanisamy

Narasimhan

Paul³

et al. 2023

Hydrological Processes

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Mekong River Basin (MRB) experiences extreme droughts and floods frequently, due to the precipitation deficit across the basin. The meteorological droughts will have a profound impact on the distribution of soil moisture and hence agricultural productivity, which will lead to the reduction of surface water resources. It is therefore important to evaluate the deficits in hydrometeorological extremes, that is, precipitation, soil moisture, and streamflow to help decipher how one drought results in the other. In this study, a streamflow deficit index (SDI) has been proposed and applied to understand the changes in hydrology due to the fluctuations in precipitation and soil moisture in the Mekong River Basin (MRB). The study used percent normal (PN), a precipitation deficit index, and soil moisture deficit index (SMDI) to identify the initiation and sustenance of hydrological drought using SDI.The SMDI was obtained from soil moisture simulated using the soil and water assessment tool (SWAT) for the periods of 1980-2008. The study results suggested that the proposed index was able to represent the historical river flow deficit that persisted in the basin in the year 1992. Increasing variation in the streamflow deficit in parts of Thailand, Lao PDR, Vietnam, and Cambodia from the year 1992 was also captured by SDI. The flooding year 2000, which resulted in an economic loss of over 200 million USD, was also effectively captured by the proposed index. The lengthening of the streamflow drought, a metric used to represent drought propagation, was shorter by at least 2 months in forested catchments compared with that of agricultural catchments, which implies that any deficit in precipitation and soil moisture, will have a severe impact on agricultural basins. Similarly, the attenuation of both agricultural and hydrological drought was found to be smaller in forested subbasins than those in agricultural subbasins. The findings of the study will be useful for the timely identification of extreme hydrological events and for planning mitigation measures.

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Soil moisture and its applications in the Mekong River Basin

Do,

Tran,

Kim

et al. 2025

The Mekong Delta Environmental Research Guidebook

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Studying Onset and Evolution of Agricultural Drought in Mekong River Basin through Hydrologic Modeling

Cited by 5 publications

References 29 publications

Propagation of Meteorological Drought to Agricultural and Hydrological Droughts in the Tropical Lancang–Mekong River Basin

Propagation of Meteorological Drought to Agricultural and Hydrological Droughts in the Tropical Lancang–Mekong River Basin

Development and propagation of hydrologic drought from meteorological and agricultural drought in the Mekong River Basin

Soil moisture and its applications in the Mekong River Basin

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