Palaeoclimatological perspective on river basin hydrometeorology: case of the Mekong Basin

Räsänen, Timo A.; Lehr, Chris; Mellin, Ilkka; Ward, Philip J.; Kummu, Matti

doi:10.5194/hess-17-2069-2013

Cited by 19 publications

(7 citation statements)

References 51 publications

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“…TC can induce a large amount of instantaneous precipitation in the MB by extreme rainfall events that may cause flooding. Meanwhile, the ENSO is associated with the interannual hydrometeorology and discharge variability (Räsänen and Kummu, ; Räsänen et al, ), which could also lead to extreme water‐related events. Due to the climate change, the non‐stationary atmospheric circulations could be a reason for increasing hydroclimate change in the MB (Delgado et al, ).…”

Section: Study Area and Datamentioning

confidence: 99%

Assessing reliability of precipitation data over the Mekong River Basin: A comparison of ground‐based, satellite, and reanalysis datasets

Chen

Azorín-Molina

2018

Intl Journal of Climatology

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Accurate precipitation data are the basis for hydro‐climatological studies. As a highly populated river basin, with the biggest inland fishery in Southeast Asia, freshwater dynamics is extremely important for the Mekong River Basin (MB). This study focuses on evaluating the reliability of existing gridded precipitation datasets both from satellite and reanalysis, with a ground observations‐based gridded precipitation dataset as the reference. Two satellite products (Tropical Rainfall Measuring Mission [TRMM] and the Precipitation Estimation from Remote Sensing Information using an Artificial Neural Network—Climate Data Record [PERSIANN‐CDR]), as well as three reanalysis products (Modern‐Era Retrospective analysis for Research and Applications [MERRA2], the European Centre for Medium‐Range Weather Forecasts interim reanalysis [ERA‐Interim], and the Climate Forecast System Reanalysis [CFSR]) were compared with the Asian Precipitation—Highly Resolved Observational Data Integration Towards Evaluation of Water Resources (APHRODITE) over the MB. The APHRODITE was chosen as the reference for the comparison because it was developed based on ground observations and has also been selected as reference data in previous studies. Results show that most of the assessed datasets are able to capture the major climatological characteristics of precipitation in the MB for the 10‐year study period (1998–2007). Generally, both satellite data (TRMM and PERSIANN‐CDR) show higher reliability than reanalysis products at both spatial and temporal scales across the MB, with the TRMM outperforming when compared to the PERSIANN‐CDR. For the reanalysis products, MERRA2 is more reliable in terms of temporal variability, but with some underestimation of precipitation. The other two reanalysis products CFSR and ERA‐Interim are relatively unreliable due to large overestimations. CFSR is better positioned to capture the spatial variability of precipitation, while ERA‐Interim shows inconsistent spatial patterns but more realistically resembles the daily precipitation probability. These findings have practical implications for future hydro‐climatological studies.

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Section: Study Area and Datamentioning

confidence: 99%

Assessing reliability of precipitation data over the Mekong River Basin: A comparison of ground‐based, satellite, and reanalysis datasets

Chen

Azorín-Molina

2018

Intl Journal of Climatology

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“…Huang et al, 2004). Thus, a hydrometeorological study linking with the ENSO cycle will help to better model the local flow regime from a large-scale perspective Räsänen et al, 2013).…”

Section: Inflows To the Mlyrmentioning

confidence: 99%

Should the Three Gorges Dam be blamed for the extremely low water levels in the middle–lower Yangtze River?

Lai

Jiang

Gao

et al. 2013

Hydrological Processes

120

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Extremely low water level events have frequently occurred in the middle–lower Yangtze River (MLYR) in recent years (2006–2011). Most of these drought events coincided with the initial operation of the Three Gorges Dam (TGD). The TGD was therefore the focus of controversy about the causes of the hydrological droughts of the rivers and lakes of the region. We quantified the effects of the TGD's operation on water levels from 2006 to 2011 using a newly developed hydrodynamic model. The operation of the TGD significantly exacerbated the severe hydrological droughts that occurred in late September to November because of water impoundment, but it increased water levels from April to early June in the MLYR because of the drawdown of TGD water levels. Evidence suggests that the recent extremely low water levels were mainly because of the remarkable decline in inflows to the MLYR resulting from precipitation changes and possible human activities. Nevertheless, it should be noted that the effects of the TGD on downstream rivers and lakes will be intensified in the foreseeable future. Copyright © 2013 John Wiley & Sons, Ltd.

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“…Räsänen et al . () also concluded that the Mekong has experienced exceptional levels of interannual variability during the post‐1950 period. Hanh and Furukawa () investigated data from seven tide gauges recording sea‐level changes across the coasts of Vietnam.…”

Section: Introductionmentioning

confidence: 96%

Analysis and attribution of trends in water levels in the Vietnamese Mekong Delta

et al. 2015

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In the Vietnamese Mekong Delta (VMD), water levels at some stations have increased. However, the factors that cause this rise in the VMD have not been identified. We considered four factors that may have contributed to the water level rise: (1) increased runoff from upstream, (2) sea-level rise, (3) land subsidence, and (4) decrease in flood mitigation function because of construction of high dykes. We analysed daily maximum and minimum water levels, and mean daily water levels from 24 monitoring stations from 1987 to 2006. Using daily and annual water level differences, we classified the delta into two groups: one is dominated by flows from upstream, while the other is tide dominated. We then tested the trends of annual maximum and minimum water levels using the Mann-Kendall test, and identified the slope of the trend using the method of Sen. The areas of dyke construction were estimated using the Enhanced Vegetation Index (EVI) and Land Surface Water Index (LSWI) from the Moderate Resolution Imaging Spectroradiometer (MODIS) data. Results show (1) river inflow has little impact on rising water levels in the VMD, (2) the influence of high dykes on water level rise could not be quantified in this study, and (3) both maximum and minimum water levels significantly increased in the tide-dominated area. Trend of annual minimum water level can be considered as the sum sea-level rise and land subsidence. Therefore, we attribute 6.05 mm year À1 (80%) to land subsidence and 1.42 mm year À1 (20%) to sea level rise, indicating that inundations have been severe in the VMD, caused primarily by land subsidence. Figure 9. Dyke construction areas and trends of annual maximum water level (mm year À1 ). Red areas highlight where high dykes have been constructed 844 Y. FUJIHARA ET AL.

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Palaeoclimatological perspective on river basin hydrometeorology: case of the Mekong Basin

Cited by 19 publications

References 51 publications

Assessing reliability of precipitation data over the Mekong River Basin: A comparison of ground‐based, satellite, and reanalysis datasets

Assessing reliability of precipitation data over the Mekong River Basin: A comparison of ground‐based, satellite, and reanalysis datasets

Should the Three Gorges Dam be blamed for the extremely low water levels in the middle–lower Yangtze River?

Analysis and attribution of trends in water levels in the Vietnamese Mekong Delta

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