Decline in suspended sediment concentration delivered by the Changjiang (Yangtze) River into the East China Sea between 1956 and 2013

Dai, Zhijun; Fagherazzi, Sergio; Mei, Xuefei; Gao, Jinjuan

doi:10.1016/j.geomorph.2016.06.009

Cited by 207 publications

(92 citation statements)

References 56 publications

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“…This phenomenon was dominated by the marine water mass in the offshore of the Yangtze Estuary and less sediment discharge from the Yangtze River [47]. At the same time, the predicted [SPM] OLI in the west of 121.7 • N was basically consistent with [SPM] GOCI , which was slightly higher than that in the east of 122.4 • N since it is mainly controlled by the river runoff and sediment discharge in the upper reaches of the Yangtze River [44,48]. The section from 121.7 • N to 122.4 • N is located in the maximum turbidity zone of the Yangtze Estuary, with the highest [SPM] and relatively large spatiotemporal variations.…”

Section: The Spatiotemporal Variations Of [Spm]mentioning

confidence: 62%

“…From the view of the cross-section shown in Figure 14 turbidity zone of the Yangtze Estuary that leads to resuspension of bottom sediments [49]. The exchange of materials and waters between the channels and tidal flats was strong under complex hydrodynamic conditions [48,50]. This implies a need for the observation with both of the high spatial and temporal resolution data.…”

Section: The Spatiotemporal Variations Of [Spm]mentioning

confidence: 99%

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Fusion of Landsat-8/OLI and GOCI Data for Hourly Mapping of Suspended Particulate Matter at High Spatial Resolution: A Case Study in the Yangtze (Changjiang) Estuary

2018

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Suspended particulate matter (SPM) concentrations ([SPM]) in the Yangtze estuary, which has third-order bifurcations and four outlets, exhibit large spatial and temporal variations. Studying the characteristics of these variations in [SPM] is important for understanding sediment transport and pollutant diffusion in the estuary as well as for the construction of port and estuarine engineering structures. The 1-h revisit frequency of the Geostationary Ocean Color Imager (GOCI) sensor and the 30-m spatial resolution of the Landsat 8 Operational Land Imager (L8/OLI) provide a new opportunity to study the large spatial and temporal variations in the [SPM] in the Yangtze estuary. In this study, [SPM] images with a temporal resolution of 1 h and a spatial resolution of 30 m are generated through the product-level fusion of [SPM] data derived from L8/OLI and GOCI images using the Spatial and Temporal Adaptive Reflectance Fusion Model (STARFM). The results show that the details and accuracy of the spatial and temporal variations are maintained well in the [SPM] images that are predicted based on the fused images. Compared to the [SPM] observations at fixed field stations, the mean relative error (MRE) of the predicted SPM is 17.7%, which is lower than that of the GOCI-derived [SPM] (27.5%). In addition, thanks to the derived high-resolution [SPM] with high spatiotemporal dynamic changes, both natural phenomena (dynamic variation of the maximum turbid zone) and human engineering changes leading to the dynamic variability of SPM in the channel are observed.

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Section: The Spatiotemporal Variations Of [Spm]mentioning

confidence: 62%

Section: The Spatiotemporal Variations Of [Spm]mentioning

confidence: 99%

Fusion of Landsat-8/OLI and GOCI Data for Hourly Mapping of Suspended Particulate Matter at High Spatial Resolution: A Case Study in the Yangtze (Changjiang) Estuary

2018

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“…However, nitrogen and phosphorus inputs from rivers and SGD could be enhanced by nutrients and other materials through natural processes or anthropogenic activities (e.g., fertilizer use and sewage discharge) in watersheds and coastal zones (Burnett et al, ; X. L. Wang et al, ). Generally, the major driving forces of rivers are climate change and human activities (Lu et al, ; Dai et al, , ). However, the driving forces of SGD include terrestrial driving forces (mainly hydraulic gradients) and marine driving forces (such as tidal pumping, density gradients, waves, storms, and seabed topography; Zhang et al, ).…”

Section: Introductionmentioning

confidence: 99%

Submarine Groundwater‐Borne Nutrients in a Tropical Bay (Maowei Sea, China) and Their Impacts on the Oyster Aquaculture

Chen

Lao

Wang

et al. 2018

Geochem Geophys Geosyst

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Submarine groundwater discharge (SGD) has been recognized as an important pathway for nutrients into estuaries, coasts, and the adjacent seas. In this study, 222Rn was used to estimate the SGD‐associated nutrient fluxes into an aquaculture area in a typical tropical bay (Maowei Sea, China). The SGD into the Maowei Sea during June 2016 was estimated to be 0.36 ± 0.33 m d−1 and was associated with SGD‐derived dissolved inorganic nitrogen (DIN), dissolved inorganic phosphorus (DIP), and dissolved silicon (DSi) fluxes (mol d−1) of (4.5 ± 5.5) × 106, (5.3 ± 9.1) × 104, and (9.4 ± 9.3) × 106, respectively. The SGD‐derived nutrients (i.e., DIN, DIP, and DSi) were more than 1.9, 0.9, and 3.6 times the amounts in the local river input and served as dominant sources in the nutrient budgets in the Maowei Sea. Moreover, the N/P ratios in the SGD around the Maowei Sea were high (mean: 64), and these ratios likely exceeded the environmental self‐purification capacity, thereby enhancing the biomass and changing the phytoplankton community structure. Therefore, SGD processes with derived nutrients may affect the biogeochemical cycles and marine ecological environment in the Maowei Sea. Furthermore, the N/P ratios (∼67) in oysters are very close to those in the SGD in the Maowei Sea; this coincidence suggests that the high N/P ratios in the SGD are likely to be one of the most important sources that support oyster aquaculture, which might weaken the burden of water eutrophication in the Maowei Sea.

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“…This strategy aims to minimize impacts on the total run‐off (Chen et al, ). In addition, the reservoir intercepts a large amount of sediment from upstream, leading to a dramatic decrease in the transported load downstream (Dai & Lu, ; Yang, Xu, Milliman, Yang, & Wu, ; Dai, Fagherazzi, Mei, & Gao, ; Zhou, Xia, Lu, Deng, & Lin, ). Since impoundment of the reservoir, erosion has occurred in downstream river channels, and the thalweg has become incised (Dai & Liu, ), most significantly in the dam‐proximal part of the Jingjiang reach (Xia et al, ; Xia, Deng, Zhou, Lu, & Xu, ).…”

Section: Introductionmentioning

confidence: 99%

Impact of the operation of a large‐scale reservoir on downstream river channel geomorphic adjustments: A case study of the Three Gorges

Yang

Zhang

Zhu

et al. 2018

River Research & Apps

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To evaluate the effects of reservoir construction on the geomorphology of downstream reaches, a case study is performed on the Three Gorges Reservoir (TGR) by comparing data collected before and after impoundment of the reservoir. This study focuses on a 1,183‐km‐long reach downstream from the TGR and investigates the temporal and spatial characteristics and patterns of geomorphic adjustment in the downstream reaches. The amount of erosion in flood plain channels and the annual average intensity of erosion in downstream reaches after 12 years of impoundment are larger than the predicted values before the impoundment of the TGR. The maximum intensity of erosion was found at 410 km from the dam, with an average thalweg incision of 1.5 m, and the main zone of erosion migrated approximately 80 km downstream. At both preimpoundment and postimpoundment, erosion occurred the along beaches and channels in the Yichang–Chenglingji reach. The pattern of erosional channels and depositional river floodplain changed to erosional channels and erosional river floodplain in the Chenglingji–Hankou reach after the trial impoundment stage. In the Hankou–Hukou reach, the erosional channels and depositional river floodplain pattern changed to erosional deep channels, erosional low beaches, and depositional high‐river floodplain during the early impoundment stage. After the trial impoundment stage, erosion continued in the deep channels, but minor deposition occurred on the river floodplain. Moreover, the discharge of clear water increased, and the duration from middle to low‐water levels increased, leading to more concentrated erosion in low‐water channels. The intensity of the erosion along the river floodplain decreased due to the shortened duration of high‐water levels and reduced human activity.

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Decline in suspended sediment concentration delivered by the Changjiang (Yangtze) River into the East China Sea between 1956 and 2013

Cited by 207 publications

References 56 publications

Fusion of Landsat-8/OLI and GOCI Data for Hourly Mapping of Suspended Particulate Matter at High Spatial Resolution: A Case Study in the Yangtze (Changjiang) Estuary

Fusion of Landsat-8/OLI and GOCI Data for Hourly Mapping of Suspended Particulate Matter at High Spatial Resolution: A Case Study in the Yangtze (Changjiang) Estuary

Submarine Groundwater‐Borne Nutrients in a Tropical Bay (Maowei Sea, China) and Their Impacts on the Oyster Aquaculture

Impact of the operation of a large‐scale reservoir on downstream river channel geomorphic adjustments: A case study of the Three Gorges

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