Architecture and evolution of the tide-dominated Changjiang (Yangtze) River delta, China

Hori, Kazuaki; Saito, Yoshiki; Zhao, Qi; Wang, Pinxian

doi:10.1016/s0037-0738(01)00122-1

Cited by 225 publications

(102 citation statements)

References 26 publications

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“…Indeed, during low flow, the right channel is more flood dominated with respect to velocity (Figures 5 and 10) than the left channel, and sediment is generally imported in the right channel and exported via the left channel ( Figures 11 and 13). This pattern of sediment transport around the shoal may be related to the shoal's maintenance and, ultimately, its emergence as another channel island [Hori et al, 2002].…”

Section: Geomorphic Responsementioning

confidence: 98%

Sediment dynamics in the lower Mekong River: Transition from tidal river to estuary

et al. 2015

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A better understanding of flow and sediment dynamics in the lowermost portions of large‐tropical rivers is essential to constraining estimates of worldwide sediment delivery to the ocean. Flow velocity, salinity, and suspended‐sediment concentration were measured for 25 h at three cross sections in the tidal Song Hau distributary of the Mekong River, Vietnam. Two campaigns took place during comparatively high‐seasonal and low‐seasonal discharge, and estuarine conditions varied dramatically between them. The system transitioned from a tidal river with ephemeral presence of a salt wedge during high flow to a partially mixed estuary during low flow. The changing freshwater input, sediment sources, and estuarine characteristics resulted in seaward sediment export during high flow and landward import during low flow. The Dinh An channel of the Song Hau distributary exported sediment to the coast at a rate of about 1 t s−1 during high flow and imported sediment in a spatially varying manner at approximately 0.3 t s−1 during low flow. Scaling these values results in a yearly Mekong sediment discharge estimate about 65% smaller than a generally accepted estimate of 110 Mt yr−1, although the limited temporal and spatial nature of this study implies a relatively high degree of uncertainty for the new estimate. Fluvial advection of sediment was primarily responsible for the high‐flow sediment export. Exchange‐flow and tidal processes, including local resuspension, were principally responsible for the low‐flow import. The resulting bed‐sediment grain size was coarser and more variable during high flow and finer during low, and the residual flow patterns support the maintenance of mid‐channel islands.

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Section: Geomorphic Responsementioning

confidence: 98%

Sediment dynamics in the lower Mekong River: Transition from tidal river to estuary

et al. 2015

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“…Geological and geophysical investigations have demonstrated that the mud belts elongated along coast on the inner shelf of ECS are continuous with high sedimentation rates Hori et al, 2001Hori et al, , 2002Xiao et al, 2004Xiao et al, , 2006Liu et al, , 2007Zheng et al, 2010). The detailed characteristics of this elongated inner-shelf mud belt were documented by Liu et al (2006Liu et al ( , 2007, which presented a mud belt of 800 km extending from the Yangtze estuary southward off the Zhejiang and Fujian coasts into the Taiwan Strait based on high-resolution CHIRP seismic profiles.…”

Section: Introductionmentioning

confidence: 99%

“…The detailed characteristics of this elongated inner-shelf mud belt were documented by Liu et al (2006Liu et al ( , 2007, which presented a mud belt of 800 km extending from the Yangtze estuary southward off the Zhejiang and Fujian coasts into the Taiwan Strait based on high-resolution CHIRP seismic profiles. The development history of these Yangtze-derived sediment was proposed and the preliminary sediment budget have been discussed Hori et al, 2002;Xiao et al, 2006;Liu et al, 2006;Liu et al, 2007;Zheng et al, 2010). The previous research summarized that transport mechanisms and deposition of sediments in the mud belts are mainly affected by sedimentological conditions associated with the dynamic hydrological regime such as sediment load, river discharge, and water mixing driven by the intensity of currents, tides, and waves.…”

Section: Introductionmentioning

confidence: 99%

Millennial-scale East Asian Summer Monsoon variability recorded in grain size and provenance of mud belt sediments on the inner shelf of the East China Sea during mid-to late Holocene

Wang

Zheng

Tada

et al. 2014

Quaternary International

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The response of the monsoon climate on the inner shelf of the East China Sea (ECS) to abrupt climate changes events within the monsoonal Yangtze River drainage is contentious. Repositioning of the monsoon front is thought to have been responsible for the changes in hydroclimate over the Yangtze River drainage, which has exerted great impact on the sedimentation of the inner shelf of the ECS during the Holocene. Here, we present high-resolution analyses of grain size and provenance of the sediments from core MD06-3040 recovered from the inner shelf of the ECS during MD155-Marco Polo II-IMAGES XIV cruise. Significant variability occurred in the core MD06-3040 with notable decrease in East Asian Summer Monsoon precipitation (presumably drought events) at 6000 BP, 5300 BP, 4500 BP, 3700-3300 BP, 2200 BP, 1400-1300 BP, and 800-600 BP, which coincide with the 18 O w record in the northern ECS and stalagmite 18 O sp records from southern China. Similar patterns of these temporal variations suggest that the Yangtze River discharge associated with EASM precipitation has been a dominant control on the sedimentation on the inner shelf of ECS.

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“…1), and the further correlation with more than 600 boreholes, most of which have been reported by Li et al (2000Li et al ( , 2002 and Hori et al (2002). The objective of this study is to discuss the conditions required for the formation of the shallow biogenic-gas reservoirs and to summarize the regularities of their distribution in the modern Changjiang delta area.…”

Section: Introductionmentioning

confidence: 94%

Characteristics and accumulation model of the late Quaternary shallow biogenic gas in the modern Changjiang delta area, eastern China

Zhang

Lin

2017

Pet. Sci.

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The Changjiang (Yangtze) is one of the largest rivers in the world. It formed a huge incised valley at its mouth during the Last Glacial Maximum; the incised-valley fill, approximately 80-110 m thick, supplies an important foundation for the generation of shallow biogenic-gas reservoirs. Two cores and 13 cone penetration tests were used to elaborate the characteristics, formation mechanism, and distribution of the shallow biogenic-gas reservoirs in the study area. The natural gas is mainly composed of CH 4 (generally[95%) with a d 13 C CH4 and d 13 C CO2 of -75.8 to -67.7% and -34.5 to -6.6%, respectively, and a dD CH4 of -215 to -185%, indicating a biogenic origin by the carbon dioxide reduction pathway. Commercial biogenic gas occurs primarily in the sand bodies of fluvial-channel, floodplain, and paleo-estuary facies with a burial depth of 50-80 m. Gas sources as well as cap beds are gray to yellowish-gray mud of floodplain, paleoestuary, and offshore shallow marine facies. The organic matter in gas sources is dominated by immature type III kerogen (gas prone). The difference in permeability (about 4-6 orders of magnitude) between cap beds and reservoirs makes the cap beds effectively prevent the upward escape of gas in the reservoirs. This formation mechanism is consistent with that for the shallow biogenic gas in the late Quaternary Qiantang River incised valley to the south. Therefore, this study should provide further insight into understanding the formation and distribution of shallow biogenic gas in other similar postglacial incised-valley systems.

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Architecture and evolution of the tide-dominated Changjiang (Yangtze) River delta, China

Cited by 225 publications

References 26 publications

Sediment dynamics in the lower Mekong River: Transition from tidal river to estuary

Sediment dynamics in the lower Mekong River: Transition from tidal river to estuary

Millennial-scale East Asian Summer Monsoon variability recorded in grain size and provenance of mud belt sediments on the inner shelf of the East China Sea during mid-to late Holocene

Characteristics and accumulation model of the late Quaternary shallow biogenic gas in the modern Changjiang delta area, eastern China

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