Investigation of the Mekong River basin hydrology for 1980–2000 using the YHyM

Hapuarachchi, H. A. P.; Takeuchi, Kuniyoshi; Zhou, Min; Kiem, Anthony S.; Georgievski, Mikhail; Magome, Jun; Ishidaira, Hiroshi

doi:10.1002/hyp.6934

Cited by 48 publications

(41 citation statements)

References 13 publications

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“…However, this is contrary to other studies on the Lower Mekong, which suggest that precipitation has not significantly changed over the past 50 years [27,28]. There have been widespread and significant increases in Upper Mekong temperatures, with a recent acceleration in rate.…”

Section: Historical Hydroclimatic Variabilities and Trendcontrasting

confidence: 86%

A Review of the Integrated Effects of Changing Climate, Land Use, and Dams on Mekong River Hydrology

Pokhrel

Burbano

Roush

et al. 2018

Water

196

112

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Abstract:The ongoing and proposed construction of large-scale hydropower dams in the Mekong river basin is a subject of intense debate and growing international concern due to the unprecedented and potentially irreversible impacts these dams are likely to have on the hydrological, agricultural, and ecological systems across the basin. Studies have shown that some of the dams built in the tributaries and the main stem of the upper Mekong have already caused basin-wide impacts by altering the magnitude and seasonality of flows, blocking sediment transport, affecting fisheries and livelihoods of downstream inhabitants, and changing the flood pulse to the Tonle Sap Lake. There are hundreds of additional dams planned for the near future that would result in further changes, potentially causing permanent damage to the highly productive agricultural systems and fisheries, as well as the riverine and floodplain ecosystems. Several studies have examined the potential impacts of existing and planned dams but the integrated effects of the dams when combined with the adverse hydrologic consequences of climate change remain largely unknown. Here, we provide a detailed review of the existing literature on the changes in climate, land use, and dam construction and the resulting impacts on hydrological, agricultural, and ecological systems across the Mekong. The review provides a basis to better understand the effects of climate change and accelerating human water management activities on the coupled hydrological-agricultural-ecological systems, and identifies existing challenges to study the region's Water, Energy, and Food (WEF) nexus with emphasis on the influence of future dams and projected climate change. In the last section, we synthesize the results and highlight the urgent need to develop integrated models to holistically study the coupled natural-human systems across the basin that account for the impacts of climate change and water infrastructure development. This review provides a framework for future research in the Mekong, including studies that integrate hydrological, agricultural, and ecological modeling systems.

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Section: Historical Hydroclimatic Variabilities and Trendcontrasting

confidence: 86%

A Review of the Integrated Effects of Changing Climate, Land Use, and Dams on Mekong River Hydrology

Pokhrel

Burbano

Roush

et al. 2018

Water

196

112

View full text Add to dashboard Cite

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“…Jeffrey et al, 2001;Hapuarachchi et al, 2008;Kiem et al, 2008;Jones et al, 2009). There are currently two Australia-wide monthly gridded rainfall datasets available.…”

Section: R Tozer Et Al: Uncertainties Associated With Using Gridmentioning

confidence: 99%

On the uncertainties associated with using gridded rainfall data as a proxy for observed

Tozer

Kiem

Verdon‐Kidd

2012

Hydrol. Earth Syst. Sci.

111

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Abstract. Gridded rainfall datasets are used in many hydrological and climatological studies, in Australia and elsewhere, including for hydroclimatic forecasting, climate attribution studies and climate model performance assessments. The attraction of the spatial coverage provided by gridded data is clear, particularly in Australia where the spatial and temporal resolution of the rainfall gauge network is sparse. However, the question that must be asked is whether it is suitable to use gridded data as a proxy for observed point data, given that gridded data is inherently "smoothed" and may not necessarily capture the temporal and spatial variability of Australian rainfall which leads to hydroclimatic extremes (i.e. droughts, floods). This study investigates this question through a statistical analysis of three monthly gridded Australian rainfall datasets -the Bureau of Meteorology (BOM) dataset, the Australian Water Availability Project (AWAP) and the SILO dataset. The results of the monthly, seasonal and annual comparisons show that not only are the three gridded datasets different relative to each other, there are also marked differences between the gridded rainfall data and the rainfall observed at gauges within the corresponding grids -particularly for extremely wet or extremely dry conditions. Also important is that the differences observed appear to be non-systematic. To demonstrate the hydrological implications of using gridded data as a proxy for gauged data, a rainfall-runoff model is applied to one catchment in South Australia initially using gauged data as the source of rainfall input and then gridded rainfall data. The results indicate a markedly different runoff response associated with each of the different sources of rainfall data. It should be noted that this study does not seek to identify which gridded dataset is the "best" for Australia, as each gridded data source has its pros and cons, as does gauged data. Rather, the intention is to quantify differences between various gridded data sources and how they compare with gauged data so that these differences can be considered and accounted for in studies that utilise these gridded datasets. Ultimately, if key decisions are going to be based on the outputs of models that use gridded data, an estimate (or at least an understanding) of the uncertainties relating to the assumptions made in the development of gridded data and how that gridded data compares with reality should be made.

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“…It satisfies well the criteria described above and, as it was developed by one of the authors, the authors' laboratory has a large stock of experiences of successful application of BTOPMC to various parts of the world (Takeuchi et al 1999, Ao et al 2003, Shrestha et al 2007, Hapuarachchi et al 2008, Silva et al 2010, Manandhar et al 2012.…”

Section: Introductionmentioning

confidence: 70%

Challenges of hydrological analysis for water resource development in semi-arid mountainous regions: case study in Iran

Hishinuma

Takeuchi

Magome

2014

Hydrological Sciences Journal

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This study modified the BTOPMC (Block-wise TOPMODEL with the Muskingum-Cunge routing method) distributed hydrological model to make it applicable to semi-arid regions by introducing an adjustment coefficient for infiltration capacity of the soil surface, and then applied it to two catchments above the dams in the Karun River basin, located in semi-arid mountain ranges in Iran. The application results indicated that the introduced modification improved the model performance for simulating flood peaks generated by infiltration excess overland runoff at a daily time scale. The modified BTOPMC was found to fulfil the need to reproduce important signatures of basin hydrology for water resource development, such as annual runoff, seasonal runoff, low flows and flood flows. However, it was also very clear that effective model use was significantly constrained by the scarcity of ground-gauged precipitation data. Considerable efforts to improve the precipitation data acquisition should precede water resource development planning.Key words BTOPMC; water resource development; infiltration excess overland runoff; snowpack and snowmelt; data scarcity; semi-arid; Karun River basin; Iran Défis de l'analyse hydrologique pour le développement des ressources en eau dans les régions montagneuses semi-arides : étude de cas en Iran Résumé Dans cette étude, nous avons modifié le modèle hydrologique distribué BTOPMC (Block-wise TOPMODEL with the Muskingum-Cunge routing method -TOPMODEL par bloc avec méthode de routage Muskingum-Cunge) pour le rendre applicable à des régions semi-arides, en introduisant un coefficient d'ajustement de la capacité d'infiltration de la surface du sol. Nous l'avons ensuite appliqué à deux bassins versants situés en amont de barrages sur le bassin de la rivière Karun, dans des zones montagneuses semiarides d'Iran. Les résultats de cette application ont indiqué que la modification introduite a amélioré la performance du modèle pour simuler les pointes de crue générées par ruissellement de surface par dépassement de la capacité d'infiltration, au pas de temps journalier. Nous avons trouvé que le modèle BTOPMC modifié répond au besoin de reproduction des signatures importantes de l'hydrologie du bassin pour le développement des ressources en eau, telles que les écoulements annuels ou saisonniers, les débits d'étiage ou de crue. Cependant, il est apparu également très clairement que l'utilisation concrète du modèle a été considérablement contrainte par la rareté des données de précipitations issues de postes au sol. Des efforts considérables devraient être faits pour améliorer l'acquisition de données de précipitations préalablement à la planification du développement de la ressource en eau.Mots clefs BTOPMC ; développement des ressources en eau ; ruissellement de surface par dépassement de la capacité d'infiltration ; manteau neigeux et fonte nivale ; rareté des données ; semi-aride ; bassin de la rivière Karun ; Iran

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Investigation of the Mekong River basin hydrology for 1980–2000 using the YHyM

Cited by 48 publications

References 13 publications

A Review of the Integrated Effects of Changing Climate, Land Use, and Dams on Mekong River Hydrology

A Review of the Integrated Effects of Changing Climate, Land Use, and Dams on Mekong River Hydrology

On the uncertainties associated with using gridded rainfall data as a proxy for observed

Challenges of hydrological analysis for water resource development in semi-arid mountainous regions: case study in Iran

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