An integrated modeling approach for mineral and metal transport in acidic rivers at high mountainous porphyry Cu systems

Zegers, Gerardo; Navarro-Valdivia, Leonardo; Lagos-Zúñiga, Miguel; Navarrete-Calvo, Alvaro; Caraballo, Manuel A.; Niño, Yarko; McPhee, James; Montserrat, Santiago

doi:10.1016/j.jhydrol.2021.126718

Cited by 5 publications

(3 citation statements)

References 60 publications

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“…Since sediments greatly affect metal transport in rivers by adsorption [22], it is really important to consider how river morphology is attributed to the increase of metal accumulation in rivers. From the literature, the river morphology factors that most strongly affect metal transport in rivers were identified as follows: slope [56], river bends [57], channel width, length and sinuosity [26,27]. River slope has a direct correlation with river velocity, thereby affecting the flow of water and sediment transport, while river bends represents the meandering of the river channel that also affects the deposition of sediments.…”

Section: Assessment Of River Morphologymentioning

confidence: 99%

Spatio-Temporal Assessment of Manganese Contamination in Relation to River Morphology: A Study of the Boac and Mogpog Rivers in Marinduque, Philippines

2023

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This study investigates the contribution of river morphology towards the occurrence of manganese (Mn) in both sediment and surface water (SW), considering the temporal climatic and spatial conditions. The Boac and Mogpog rivers on the island province of Marinduque, Philippines, were examined in this study. These rivers are downstream of the two abandoned open mine pits at San Antonio and Tapian, where mining disasters occurred in 1993 and 1996, respectively. Field sampling programs were conducted in 2019, 2021 and 2022 to measure the Mn concentrations in sediment and SW, and the physicochemical parameters in SW during the same sampling event. Geographic Information System (GIS) tools were employed to characterize the morphology of each river, specifically river slope, river bends, sinuosity, and channel width and length. The Boac and Mogpog rivers were divided into 22 and 15 river segments, respectively, to account for spatial heterogeneity of all parameters. Correlation (r) analysis on the average Mn concentration and river morphology within each segment was performed and indicated that river bends (Boac r = 0.421, Mogpog r = 0.356) and sinuosity (Boac r = 0.403, Mogpog r = 0.352) had the highest correlation with Mn concentrations in sediment. While river slope (Boac r = 0.716, Mogpog r = 0.282) and sinuosity (Boac r = 0.505, Mogpog r = 0.257) were the highest for Mn in SW. This confirmed that the planform of the river affected the accumulation of Mn due to its effect on sediment deposition along the river and its potential to adsorb and/or desorb metals. Furthermore, the pH of SW also directly correlated with sediment Mn (r = 0.293), and inversely correlated with SW Mn (r = −0.465), which was expected as acidic water promotes the release of metals from sediments to SW. The results from this study will aid local government, environmental engineers and managers in their mitigation program through identification of the areas and segments in the river that contain the highest and the least contamination. This is to optimize financial and human resources during river system remediation and monitoring. Data and information extracted from this study are useful in other areas of similar condition.

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Section: Assessment Of River Morphologymentioning

confidence: 99%

Spatio-Temporal Assessment of Manganese Contamination in Relation to River Morphology: A Study of the Boac and Mogpog Rivers in Marinduque, Philippines

2023

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“…Karst characteristics factors (KCF) encompass exposed rock, thin and discontinuous soil layers (Xiong & Li, 2024), and abundant karst development morphology underground among other factors. The presence of exposed rock can alter the hydrodynamic properties of slope flows, thereby delaying the arrival time of runoff in the channel (Zegers et al, 2021). The lithology and hydrogeological structures in karst regions are unique and complex, with typical binary underground hydrogeological structures (Luo et al, 2016).…”

Section: Introductionmentioning

confidence: 99%

Mediation effects of vegetation, land use and cover change and karst characteristics on hydrologic processes in heterogeneous karst basins

Wu,

Li,

Xiao

et al. 2024

Hydrological Processes

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A thorough understanding of the complex response of hydrologic processes to latent factors is of great significance for regional soil erosion and water resources management. However, what kind of mediation effect exists between hydrologic processes and latent factors is not yet clear, especially in heterogeneous karst regions. In this study, the elasticity coefficient method and partial least squares structural equation modelling (PLS‐SEM) were used to investigate the mechanism of latent factors on hydrologic processes in karst basins and to explore the mediation effect between latent factors and hydrologic processes. The results show that the runoff of Yeji River Basin decreased during 1997–2004, but increased or stabilized since 2005. On the monthly scale, the runoff in July and December showed an ‘inverted V‐shaped’ change. Both elasticity coefficient method and PLS‐SEM showed that climate change contributed the most to runoff (direct effect accounted for 37.94% ~ 61.41%). In PLS‐SEM, the total effect sizes of latent factors on runoff were as follows: climate change (0.751 ~ 0.963) > vegetation (0.296 ~ 0.740) > karst characteristics factors (KCF) (−0.454 ~ −0.563) > human activities (−0.036 ~ −0.528) > land use and cover change (LUCC) (−0.036 ~ −0.205). In the typical karst basin, two mediation pathways have been determined: human activities‐vegetation/LUCC‐runoff, where vegetation and LUCC had a mediation effect of relationships between human activities and runoff; climate change‐KCF‐runoff, where KCF had a mediation effect of relationships between climate change and runoff. Moreover, PLS‐SEM is a preferred method to decouple the complex responses of hydrologic processes in heterogeneous karst basins to climate change and human activities than the elasticity coefficient method. This study conducted further research and exploration on the mechanism of hydrologic processes in heterogeneous karst basins, and provided valuable theoretical references for grassroots water managers to cope with water resources management under the context of future climate change.

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“…Although NaCl slug injections have been utilized at low flow (<30 L/s; Szeftel et al, 2011;Kelleher et al, 2013), it remains unclear its suitability for determining D L and assessing the importance of transient storage under larger flow rates (e.g., over 800 L/s) and more complex settings, that is, high stream water velocities (e.g., over 0.8 m/s), river systems with both acid and neutral pH waters, high background salinity (over 2.0 mS/cm), and high stream sinuosity. These conditions can be easily found in mountain river systems affected by acid drainage (e.g., Zegers et al, 2021). Therefore, the possibility to have a simple and low cost approach becomes of great practical importance for the study and modeling of contaminant transport and fate in mountain headwater river systems.…”

mentioning

confidence: 99%

A simple low‐cost approach for transport parameter determination in mountain rivers

Castillo

Runkel

Duhalde

et al. 2021

River Research & Apps

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A simplified low-cost approach to experimentally determine transport parameters in mountain rivers is described, with an emphasis on the longitudinal dispersion coefficient (D L ). The approach is based on a slug injection of table salt (NaCl) as a tracer and specific conductance readings at different locations downstream of the injection spot. Observed specific conductance readings are fit using the advection-dispersion equation with OTIS-P, yielding estimates of cross-sectional area and longitudinal dispersion coefficient for various stream reaches. Estimates of the D L are used to assess the accuracy of several empirical equations reported in the literature. This allowed the determination of complementary transport parameters related to transient storage zones. The empirical equations yielded rather high D L values, with some reaching up an order of magnitude higher to those obtained from tracer additions and OTIS-P. Overall, the proposed approach seems reliable and pertinent for river reaches of ca. 150 m in length.

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An integrated modeling approach for mineral and metal transport in acidic rivers at high mountainous porphyry Cu systems

Cited by 5 publications

References 60 publications

Spatio-Temporal Assessment of Manganese Contamination in Relation to River Morphology: A Study of the Boac and Mogpog Rivers in Marinduque, Philippines

Spatio-Temporal Assessment of Manganese Contamination in Relation to River Morphology: A Study of the Boac and Mogpog Rivers in Marinduque, Philippines

Mediation effects of vegetation, land use and cover change and karst characteristics on hydrologic processes in heterogeneous karst basins

A simple low‐cost approach for transport parameter determination in mountain rivers

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