Variation in flow and suspended sediment transport in a montane river affected by hydropeaking and instream mining

Béjar, M.; Vericat, Damià; Batalla, Ramón J.; Gibbins, Chris

doi:10.1016/j.geomorph.2018.03.001

Cited by 30 publications

(24 citation statements)

References 58 publications

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“…The pollution issues in the sediments of TGR have been increasingly highlighted [55,56], and the regular analytical method [57] and artificial intelligence algorithms [58] have been extensively used to identify the pollution sources. Results at 14 stations that covered the upper to the lower reaches of the TGD showed that mean concentrations of heavy metals in the sediments were higher than the geochemical background values and those in the soils after the impoundment of the TGD [59], this is consistent with the result form Bing et al [54] who found that concentrations of heavy metal in the sediments increased after the TGD operation River sediment is a worldwide concern because of its significant importance in shaping the physical riverscape and regulating the associated ecological systems [4,5]. Over recent decades, many rivers have experienced decreasing SSC [60].…”

Section: Discussionsupporting

confidence: 80%

Spatio-Temporal Patterns and Impacts of Sediment Variations in Downstream of the Three Gorges Dam on the Yangtze River, China

et al. 2018

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Spanning the Yangtze River of China, the Three Gorges Dam (TGD) has received considerable concern worldwide with its potential impacts on the downstream side of the dam. This work investigated the spatio-temporal variations of suspended sediment concentration (SSC) at the downstream section of Yichang-to-Chenglingji from 2002 to 2015. A random forest model was developed to estimate SSC using MODIS ground reflectance products, and the spatio-temporal distributions of SSC were retrieved with this model to investigate the characteristics of water-silt variation. Our results revealed that, relatively, SSC before 2003 was evenly distributed in the downstream Yangtze River, while this spatial distribution pattern changed ce 2003 when the dam started storing water. Temporally, the SSC demonstrated a W-shaped curve of seasonal variation as one peak occurred in September and two troughs in March and November, and showed a significantly decreasing trend after three-stage impoundment. After official operation of the TGD in 2009, the SSC was reduced by over 40% than before 2003. Spatially, the most significant changes occurred in the upper Jingjiang section, where the SSC dropped by 45%. During all stages of impoundment, the water impoundment to 135 m in 2003 had the most significant impact on suspended sediment. The decreased SSC has led to emerging risks of bank failure, aggravated erosion of water front and aggressive down-cutting erosion along the downstream of the dam, as well as other ecological and environmental issues that require urgent attention by the government.

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Section: Discussionsupporting

confidence: 80%

Spatio-Temporal Patterns and Impacts of Sediment Variations in Downstream of the Three Gorges Dam on the Yangtze River, China

et al. 2018

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“…The median size of the surface sediments ranges from 54 to 76 mm, so based on the Wentworth scale, the characteristic sediments in the reach are very coarse gravels (i.e., from 1,230 samples; unpublished data). The study reach is affected by hydropeaking and has experienced instream gravel mining since 1970 (more details in Béjar et al, ); previous studies have demonstrated that it has relatively impoverished benthic invertebrate communities (Palau‐Nadal, Palau, Alcázar, & Béjar, ).…”

Section: Study Area and Methodsmentioning

confidence: 99%

Influence of habitat heterogeneity and bed surface complexity on benthic invertebrate diversity in a gravel‐bed river

Béjar

Gibbins

Vericat

et al. 2020

River Research & Apps

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Maintaining or restoring physical habitat diversity is a central tenet of sustainable river management, yet a link between habitat and ecological diversity in fluvial systems has long remained equivocal. The lack of consistent evidence partly reflects the problems of characterizing habitat in ways that are ecologically meaningful. This paper assesses the influence of habitat heterogeneity and complexity on macroinvertebrate assemblages in a mountain gravel‐bed river. With the use of 0.1‐m resolution data obtained from an acoustic Doppler current profiler, heterogeneity and complexity in hydraulic conditions and bed topography were characterized using 13 metrics applied to 30 areas, each 1 m2, with an invertebrate sample collected from each area. Turnover of invertebrate taxa (i.e., β‐diversity) between sampled areas was rather limited, but observed differences in diversity were related significantly to several metrics of habitat heterogeneity. Invertebrate abundance was related to habitat diversity, patch size coefficient of variation, and patch size, whereas the Shannon diversity was related to the number of patches and patch size. None of the habitat complexity metrics accounted for a significant amount of observed variation in invertebrate communities between sampled areas. The paper demonstrates that high‐resolution data can help reveal relationships between habitat and benthic invertebrate diversity.

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“…The sediment was then sieved to obtain the following granulometries: coarse sand (0.5–1 cm), thin sand (0.2–0.5 cm), fine sand (0.1–0.2 cm), and very fine sand (<0.1 cm). This laboratory‐controlled approach is usually performed to evaluate the specific influence of granulometry and avoids any other unpredictable characteristic of natural sediments (organic matter fraction, the presence of bacteria or other small organisms, geochemical variability, etc; Alexander et al., 1993; De la Huz et al., 2002; Nel et al., 2001), which in general could be far from being homogeneously distributed (Béjar et al, 2018). Sediment containers of 250 ml, filled with one of the four sediment sizes, were placed into 50‐L filtered water tanks at the corresponding temperature (20 or 30°C).…”

Section: Methodsmentioning

confidence: 99%

The role of temperature and oxygen availability on the distribution of Corbicula largillierti

Rodriguez

Reyna

Maggioni

et al. 2020

Invertebrate Biology

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The invasiveness of Corbicula largillierti has been underestimated, but this bivalve is currently receiving more attention. The first study of the distribution of this species along one of the major basins of central Argentina showed that it was completely absent in the major central reservoir, but was present along its tributary and effluent rivers. Ten years later, this discontinuous distribution has not changed, despite the bivalve's high dispersion capacity. The main environmental differences between the reservoir and the rivers are that the former has finer sediment grain size, higher temperatures, and lower oxygen concentration during summer months. This study aimed to evaluate whether one of these factors could be limiting the distribution of C. largillierti. We assessed the metabolic response and burial behavior (under different grain sizes) of C. largillierti over 8 weeks at 30°C against a control condition at 20°C. We also analyzed the oxygen consumption (vO2) as a function of environmental oxygen concentration (pO2) at 25°C, estimating its metabolic regulation capacity (R). This showed the existence of an environmental oxygen concentration threshold (Pt) that could be an indicative of physiological limiting concentrations that compromise species survival and settlement. After 8 weeks at 30°C, the metabolic rate of individuals of C. largillierti increased and their burial behavior was slightly compromised but mostly for coarser sediments. Concerning environmental oxygen availability, C. largillierti is an oxyconformer with a low R (39.9%), a clear pattern of negative regulation, and a low Pt (48.4% air saturation). The lack of any regulation capacity of C. largillierti under environmental oxygen limitations and the extremely low pO2 at the bottom of the reservoir during summer months may explain its failure to colonize and survive there.

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Variation in flow and suspended sediment transport in a montane river affected by hydropeaking and instream mining

Cited by 30 publications

References 58 publications

Spatio-Temporal Patterns and Impacts of Sediment Variations in Downstream of the Three Gorges Dam on the Yangtze River, China

Spatio-Temporal Patterns and Impacts of Sediment Variations in Downstream of the Three Gorges Dam on the Yangtze River, China

Influence of habitat heterogeneity and bed surface complexity on benthic invertebrate diversity in a gravel‐bed river

The role of temperature and oxygen availability on the distribution of Corbicula largillierti

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