Trends of Runoff Variation and Effects of Main Causal Factors in Mun River, Thailand During 1980–2018

Li, Renzhi; Huang, He Qing; Yu, Ge; Yu, Huiming; Bridhikitti, Arika; Su, Teng

doi:10.3390/w12030831

Cited by 14 publications

(9 citation statements)

References 44 publications

(47 reference statements)

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“…During the wet season, the analysis indicates that the UMR contributes an average fraction of 0.69 to the Main Mun River flow, while the CR contributes a slightly lower average fraction of 0.29. These findings illustrate the impact of increased precipitation during the wet season on river flows, where both tributaries significantly contribute to the Main Mun River, albeit with slight variations in their contributions [64]. Conversely, in the dry season, the UMR shows a slight increase in contribution, averaging 0.70, suggesting a consistent or slightly enhanced flow to the Main Mun River despite reduced precipitation.…”

Section: Performance Of Ann Modelsmentioning

confidence: 62%

Innovative Assessment of Mun River Flow Components through ANN and Isotopic End-Member Mixing Analysis

Chomcheawchan,

Pawana,

Julphunthong

et al. 2024

Preprint

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This study innovatively assesses the Mun River flow components in Thailand, integrating Artificial Neural Networks (ANN) and Isotopic (18O) End-Member Mixing Analysis (IEMMA). It quantifies the contributions of the Upper Mun River (UMR) and Chi River (CR) to the overall flow, revealing a discrepancy in their estimated contributions. ANN predicts the UMR and CR contribute approximately 70.1% and 29.5% respectively, while IEMMA indicates a more pronounced disparity with 84% from UMR and 16% from CR. This divergence highlights the distinct perspectives of ANN, focusing on hydrological data patterns, and IEMMA, emphasizing isotopic signatures. Despite discrepancies, both methods validate UMR as a significant contributor to the overall flow, highlighting their utility in hydrological research. The findings underscore the complexity of river systems and advocate for an integrated approach of river flow analysis for a comprehensive understanding, crucial for effective water resource management and planning.

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Section: Performance Of Ann Modelsmentioning

confidence: 62%

Innovative Assessment of Mun River Flow Components through ANN and Isotopic End-Member Mixing Analysis

Chomcheawchan,

Pawana,

Julphunthong

et al. 2024

Preprint

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“…For example, we can observe in Figure 3 an external water input for the Siagne watershed (and a little for Orb) and, conversely, an external export for the Hérault and Berre watersheds. This method, in its broad outlines, is close to the one of the double-mass curves [37,38] widely used in hydrological studies (see, for example, [39]). The DMC method uses a cumulative curve of runoff against rainfall.…”

mentioning

confidence: 90%

A Rapid Method to Estimate the Different Components of the Water Balance in Mediterranean Watersheds

Banton

St-Pierre

Giraud

et al. 2022

Water

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The sustainable management of water resources, whether surface or underground, requires the identification of the flows involved and the possibility of achieving the water balance of the water resource. These require knowledge of the main flow components with a sufficient level of accuracy. Hydrological simulation models are valuable tools for studying flow at the watershed scale but rely on data that are rarely available; therefore, they require the implementation of field investigations. There is thus a need for simple and practical tools for studying the functioning of a watershed and identifying the different components of the flows. In this paper, a method that uses only weather data, volumes of water abstraction by pumping or diversion, and flows measured at the outlet is proposed. The use of cumulative multi-year curves of measured flows or rainfall provides an assessment of the unknown flows that can take place in the watershed, as well as the order of the respective magnitudes of fast and slow flows. Its application to 20 French Mediterranean watersheds shows that it is possible to properly estimate the order of magnitude of losses or gains linked to karst flows and irrigation input. External inflows or outflows can represent up to 150% of the flow measured at the outlet. The annual volumes estimated by using this method are indeed very close (R2 = 93%) to those provided by existing knowledge. The proposed method can constitute a first approach for the quantification of flows and help to guide the implementation of field investigations and more sophisticated approaches such as hydrological modelling.

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“…As previously noted, rainfall amount within the basin varied from 800-1800 mm during the wet season [33], and from 40-120 mm in the dry season [35]. Therefore, the precipitation in the dry season was neglected, since rainfall in the wet season generally accounts for nearly 92-98% of the total annual precipitation (that is, only 2-8% for the dry season) [38,52]. Moreover, considering the wide distribution of the clastic sedimentary rock basement and the coverage of thick quaternary alluvial deposits [31,38], and that the carbonates (limestones) only distributed in the limited area of the westernmost tip of the basin (Figure 1), the contribution of carbonate weathering in this region was assumed negligible for the simplification of our calculation.…”

Section: Potential End-member Contribution Of Strontiummentioning

confidence: 99%

A Strontium and Hydro-Geochemical Perspective on Human Impacted Tributary of the Mekong River Basin: Sources Identification, Fluxes, and CO2 Consumption

Zhang

Han

Zeng

et al. 2021

Water

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As the largest and most representative tributary of the Mekong River, the Mun River Basin (MRB) provides critical understanding of regional hydro-geochemical features and rock weathering processes on a basin scale. The present study measured strontium (Sr) isotopes with hydro-geochemistry data of 56 water samples in detail in the MRB in northeast Thailand. The dissolved Sr contents and 87Sr/86Sr isotopic ratios were reported to be 8.7–344.6 μg/L (average 126.9 μg/L) and 0.7085–0.7281 (average 0.7156), respectively. The concentrations of dissolved Sr in the mainstream slightly decreased from upstream to downstream, while the variation trend of 87Sr/86Sr was on the contrary. Correlation analysis showed that Na+ strongly correlated with Cl− (0.995, p < 0.01), while Ca2+ exhibited weak relationships with SO42− (0.356, p < 0.01). Samples of the MRB exhibited lower Mg2+/Na+, Ca2+/Na+, HCO3−/Na+ and 1000Sr/Na ratios, and gathered around the end-member of evaporite dissolution, with slight shift to silicate weathering end-member, demonstrating the dominant contribution of evaporite dissolution and silicate weathering on dissolved loads. Comparing with data of major world rivers from previous research, our results remained consistency with rivers draining through similar geological conditions. The dissolved Sr flux to the adjacent Mekong River was estimated to be 20.7 tons/year. In accordance with the forward model, silicate weathering rate and CO2 consumption rate during dry season were calculated to be 0.73 tons/km2/year and 1.94 × 104 mol/km2/year, and may get underestimated due to intense water consumption by extensive agricultural activities. The superimposed effect of anthropogenic impacts on the water environment could enhance chemical weathering, and thus should be taken into account in regional ion cycles and carbon budgets. These findings highlight the coupling analysis of Sr isotopes and hydro-geochemistry in Earth surface processes and provide basic investigation for sustainable regional water treatment mechanisms in the pan basin of the Mekong River.

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Trends of Runoff Variation and Effects of Main Causal Factors in Mun River, Thailand During 1980–2018

Cited by 14 publications

References 44 publications

Innovative Assessment of Mun River Flow Components through ANN and Isotopic End-Member Mixing Analysis

Innovative Assessment of Mun River Flow Components through ANN and Isotopic End-Member Mixing Analysis

A Rapid Method to Estimate the Different Components of the Water Balance in Mediterranean Watersheds

A Strontium and Hydro-Geochemical Perspective on Human Impacted Tributary of the Mekong River Basin: Sources Identification, Fluxes, and CO2 Consumption

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