Impacts of cascade reservoirs on the longitudinal variability of fine sediment characteristics: A case study of the Lancang and Nu Rivers

Guo, Xiaojuan; Zhu, Xiao-Sheng; Yang, Zhengjian; Ma, Jun; Xiao, Shangbin; Ji, Daobin; Liu, Defu

doi:10.1016/j.jhydrol.2019.124343

Cited by 37 publications

(10 citation statements)

References 56 publications

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“…Therefore, the constructed dams could affect the transformation of NH 4 ‐N and NO 3 ‐N in sediments through change the river hydrology regime and environmental factors. Some studies reported that the changes in the reservoir age and storage capacity were directly relative to the reservoir sediment environment factors (e.g., ORP, DO, T , and M G ) (Brune, 1953; Guo et al, 2020; Wang, Jin, & Jiao, 2007), and then caused the changes of the nitrogen cycle in reservoir sediments (Akın & Ugurlu, 2005; Chen, Xia, & Ju, 2003; Ding, Zhu, Xu, Feng, & Xu, 2011; Huang & Tseng, 2001; Jin, Gong, Shi, Jin, & Li, 2017; Jorcin & Nogueira, 2005; Li et al, 2019; Patureau, Bernet, Delgenès, & Moletta, 2000; Peng, Gao, Wang, & Sui, 2002).…”

Section: Discussionmentioning

confidence: 99%

“…The oxidation–reduction potential (ORP) was measured by a portable oxidation–reduction potentiometer (QX‐6530, China). In the laboratory, in order to test the sediments mean grain size, the sediments were first passed through a 2 mm sieve after air‐drying and measured three times with a mean standard deviation of 0.005 mm by a laser diffraction analyzer using the wet method (Buurman, Pape, & Muggler, 1997; Guo et al, 2020). The concentrations of TN, NH 4 –N, and NO 3 –N in the pore water and overlying water were measured by ultraviolet spectrophotometer according to a China national standard (Wei, 2002).…”

Section: Methodsmentioning

confidence: 99%

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Effects of cascade reservoirs on the transformation of nitrogen in pore water of sediments in the Lancang River

Zhao

Wang

et al. 2021

River Research & Apps

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In the mainstream of the Lancang River, eight cascade dams have been constructed. In order to find the effects of the cascade reservoirs on the transformation of nitrate (NO3‐N) and ammonium (NH4‐N) in pore water of sediments, a field survey was carried out both in the upper natural river reach (NRR) and cascade reservoirs reach (CRR) of the Lancang River from January 10 to 20, 2018. The results indicated that (1) in the NRR, NO3‐N concentrations in sediment pore water were higher than those in the CRR, whereas the total nitrogen (TN) and NH4‐N were significantly lower; the diffusion fluxes of NH4‐N from sediment to overlying water varied from −0.180 to 0.049 mg·(m2·d)‐1, and the diffusion fluxes of NO3‐N varied from 0.012 to 0.098 mg·(m2·d)‐1. (2) in the CRR, the NH4‐N concentrations in sediment pore water were much higher than those in the overlying water, but the NO3‐N concentrations in the overlying water were much higher; the diffusion fluxes of NH4‐N from the sediments to the overlying water varied from 0.161 to 1.561 mg·(m2·d)‐1, but the NO3‐N diffused downward from the overlying water to the sediments and the diffusion fluxes varied from −0.011 to −0.223 mg·(m2·d)‐1. It was concluded that the cascade reservoirs could increase the NH4‐N concentration and inversely decrease the NO3‐N concentration in the sediment pore water, which meant that the risk of the nitrogen release from the sediment in the cascade reservoirs was much higher than that in the natural river.

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Section: Discussionmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

Effects of cascade reservoirs on the transformation of nitrogen in pore water of sediments in the Lancang River

Zhao

Wang

et al. 2021

River Research & Apps

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“…Analysis of the sedimentary environment in the Heihe River Previous studies have shown that changes in material sources and hydrodynamic properties can lead to different depositional environments (Morris & Williams, 1999). Conversely, different sedimentary environments can be inferred based on the sediment composition and grain-size parameters (Frings, 2008;Curtis et al, 2010, Guo et al,2020.…”

Section: Discussionmentioning

confidence: 99%

Effects of Cascade Reservoir Systems on the Longitudinal Distribution of Sediment Characteristics: A Case Study of the Heihe River Basin

Wang

Liu

et al. 2021

Preprint

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Spatial variations in grain-size parameters can reflect river sediment transport patterns and depositional dynamics. Therefore, 22 surficial sediment samples taken from the Heihe River and its cascade reservoirs were analyzed to better understand the impact of cascade reservoir construction on sediment transport patterns in inland rivers in China. The results showed that the longitudinal distribution of sediment grain size in the Heihe River was significantly affected by the influence of the cascade reservoirs. The grain size of the reservoir sediments within the cascade reservoir system was much lower than that of sediments in the natural river section, and the sediments in the natural river were well sorted, exhibiting leptokurtosis and positive or very positive skew. The lower reaches of the dammed river experienced strong erosion, and the grains of the bed sediments were coarse and poorly sorted; the grain-size distributions were more positively skewed and exhibited leptokurtosis. The backwater zone of the reservoir was influenced by both backwater and released water, and the sediment grain size was between the grain size of the natural river and that of the lower reaches of the dam; these sediments were moderately well sorted and had a positively skewed, leptokurtic grain-size distribution. Sedimentary environmental analysis revealed that the characteristics of the sediment grain size in an upstream tributary of the Heihe River were more influenced by source material than by hydrodynamic conditions, while the grain-size characteristics of the mainstream sediments were controlled mainly by hydrodynamic conditions.

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“…The Lancang River (LCR) is located in upstream of the Lancang-Mekong River, with an annual average discharge of about 2350 m 3 /s. The main stream of LCR is 2161 km long, with a drainage area of approximately 1.57 × 10 5 km 2 [5,29,30]. It originates in the northeast of Tanggula Mountain in Qinghai Province of China, bordering the China-Myanmar international border to the east and the China-Laos international border to the north and is formed by the rapid drift of the Indian tectonic plate to the Eurasian plate [31].…”

Section: Study Areamentioning

confidence: 99%

“…The cascade construction of large deep reservoirs affects the continuity of rivers and changes the scope of the inflow of regional sediments. The intercepted water of upstream reservoirs increases sediment deposition rates and reduces the transportation of sediments in downstream reservoirs [4,5]. Retention of sediments in upstream reservoirs and the influx of sediments in downstream areas simultaneously affect the cycle of biological matter in the sediments of downstream reservoirs and pose a severe threat to the water quality, freshwater resources and aquatic ecosystem of these reservoirs [6].…”

Section: Introductionmentioning

confidence: 99%

The Impact of Cascade Large Deep Reservoir on the Migration and Deposition of Cadmium in Lancang River

Cheng

Chen

2021

Sustainability

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Metal pollution is a global environmental problem. In order to understand the effects of the cascade hydropower development on Cd in reservoir sediments, this study investigated the migration and deposition mechanisms of Cd in reservoir sediments by using the film diffusion gradient technique (DGT) for the cascade large deep reservoirs of the Lancang River (LCR), Nuozhadu (NZD) and Xiaowan (XW). The results show that: (1) Strong correlations amongst the deposition processes of Cd, Mn and S were found in the sediments of the NZD reservoir; weak correlations between the deposition processes of Cd and Mn were found in the sediments of the XW reservoir. (2) Part of labile Cd in the pore water of the NZD reservoir was supplemented by silt and sand, and another part was inherent in the pore water; most of labile Cd in the pore water of the XW reservoir was inherent in the pore water, and minimal replenishment of sediment was noted. (3) Mn is the main factor controlling the migration of Cd in the NZD reservoir. This paper provides an effective resource for understanding the migration and deposition of Cd in the sediments of large deep reservoirs along the LCR.

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Impacts of cascade reservoirs on the longitudinal variability of fine sediment characteristics: A case study of the Lancang and Nu Rivers

Cited by 37 publications

References 56 publications

Effects of cascade reservoirs on the transformation of nitrogen in pore water of sediments in the Lancang River

Effects of cascade reservoirs on the transformation of nitrogen in pore water of sediments in the Lancang River

Effects of Cascade Reservoir Systems on the Longitudinal Distribution of Sediment Characteristics: A Case Study of the Heihe River Basin

The Impact of Cascade Large Deep Reservoir on the Migration and Deposition of Cadmium in Lancang River

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