Stepwise morphological evolution of the active Yellow River (Huanghe) delta lobe (1976–2013): Dominant roles of riverine discharge and sediment grain size

Wu, Xiao; Bi, Naishuang; Xu, Jingping; Nittrouer, Jeffrey A.; Yang, Zuosheng; Saito, Yoshiki; Wang, Houjie

doi:10.1016/j.geomorph.2017.04.042

Cited by 106 publications

(80 citation statements)

References 40 publications

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“…Evidently, as seen from Figure b and Equations to , before and after the occurrence of avulsion in 2007–2008, the mouth channels increase their lengths in linear forms with the accumulative run‐off and accumulative sediment input, which is consistent with previous observations (e.g., Zheng et al, ). Cui and Li (), Bi et al (), and Wu et al () also found that the river mouth had shifted to a slow accretion stage since 2003 due to the intensive scouring of the lower river channel during the operation of the Xiaolangdi Reservoir, which provided relatively coarser sediment. Because the riverbed scouring has weakened since 2006 (Jiang, Pan, & Chen, ), the accretion rate of new river mouth decreased obviously in 2006 (Yu, Shi, et al, ).…”

Section: Morphodynamic Changes In Relation To Hydrological Processmentioning

confidence: 98%

“…Figure a shows the spatial variation in the shorelines of the old and new river mouths of the Yellow River extracted from the selected remote sensing images taken in each May from 1999 to 2014. It is noticeable that the south‐eastern part, or the old river mouth formed from 1976 to 1996, has been shrinking, whereas the north‐eastern part, or the new river mouth formed since an avulsion that occurred in 1996, has been extending towards the sea (Bi et al, ; Wu et al, ; Xing, Wang, Yang, & Bi, ). Consequently, the land area in the whole river mouth generally had an increasing trend from 1999 to 2014 at an average rate of 4.38 km 2 year −1 , whereas it varied around approximately 240 km 2 during 1999–2001, approximately 280 km 2 from 2002 to 2004, remained stable at approximately 250 km 2 in the period of 2005–2007, and varied around approximately 300 km 2 in a small range from 2008 to 2014 (Figure b).…”

Section: Morphodynamic Change In the Mouth Of The Yellow Rivermentioning

confidence: 99%

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Hydrological controls on the evolution of the Yellow River Delta: An evaluation of the relationship since the Xiaolangdi Reservoir became fully operational

Zhou

Huang

Ran

et al. 2018

Hydrological Processes

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The Xiaolangdi Reservoir, which was constructed in the trunk of the Yellow River, has controlled the flow process into the mouth of the Yellow River to a significant degree since it began fully operating in late 2002. To evaluate the relationship between the new hydrological process and the evolution of the Yellow River estuary, this study presents a detailed investigation of the morphodynamic adjustment in the river mouth using remote sensing satellite images. It was shown that the mouth channel rapidly extended in length from 2002 to 2004, although it was shrinking during 1999-2001, and then it expanded very slowly with considerable shifts at the place where the river flow mixes with seawater. In late 2007, an avulsion occurred on the northern bank of the mouth channel, far upstream from where the river water mixes with seawater. During 2008-2012, the new mouth channel extended its length intothe sea at a slow pace, whereas since late 2013, it has divided into two branches that alternately discharge the main flow into the sea. Although both the water and the sediment input in the new hydrological process are much smaller in quantity than before, the geomorphic adjustments still manifest an excessive input of both. Moreover, after the avulsion, the seasonal pattern of land accretion in the river mouth has been characterized, with erosion occurring mostly in the wet seasons and accretion mostly occurring in the dry seasons.

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Section: Morphodynamic Changes In Relation To Hydrological Processmentioning

confidence: 98%

Section: Morphodynamic Change In the Mouth Of The Yellow Rivermentioning

confidence: 99%

Hydrological controls on the evolution of the Yellow River Delta: An evaluation of the relationship since the Xiaolangdi Reservoir became fully operational

Zhou

Huang

Ran

et al. 2018

Hydrological Processes

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“…The lower river was initially braided upon relocation, as characterized by unchannelized river flow. At this initial stage, the river-derived sediment was largely accumulated in the floodplain and/or among the antecedent rivers owing to the lack of channelization (Wu et al, 2017), filling the coast of the lake, the interfluvial lowlands of the paleo-river, and the supralittoral zone, etc., causing the destruction of hydrophytes and phreatophyte sedges in these areas. This process is indicated in our records by the significant decrease of Cyperaceae pollen percentages shown for superlobe 1 and superlobe 10 ( Figure 7b).…”

Section: Coastal Salt Marsh Response To Hydrological Changementioning

confidence: 99%

“…Eventually, natural channel adjustments resulted in the coalescence of multiple channels into a single channel (Wu et al, 2017). A large amount of river-derived sediment was deposited at the mouth of the YR, causing the progradation of the YRD.…”

Section: Coastal Salt Marsh Response To Hydrological Changementioning

confidence: 99%

Holocene vegetation dynamics in response to climate change and hydrological processes in the Bohai region

Chen¹,

Shi²,

Liu³

et al. 2020

Preprint

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Abstract. Coastal vegetation not only mitigates the damage inflicted by marine disasters on coastal area, but also plays an important role in the global carbon cycle (i.e. blue carbon). Nevertheless, detailed records of both long-term changes in coastal vegetation composition and diversity, coupled with climate change and river evolution, remain sparse. To explore vegetation dynamics and their influencing factors on the coastal area of the Bohai Sea (BS) during the Holocene, in this study, we present high-resolution pollen and grain size data obtained from a sediment core of the BS. The results reveal that two rapid and abrupt changes in salt marsh vegetation are linked with the river-system changes. Within each event, a recurring pattern – starting with a decline in Cyperaceae, followed by an increase in Artemisia and Chenopodiaceae – suggests a successional process that is determined by the close relationship between Yellow River (YR) channel shifts and the wetland community dynamics. The phreatophyte Cyperaceae at the base of each sequence indicate lower saline conditions. Unchannelized river flow characterized the onset of the YR channel shift, caused a huge river-derived sediment accumulation in the floodplain, and destroyed the sedges in the coastal depression. Along with the formation of a new channel, lateral migration of the lower channel stopped, and a new intertidal mudflat was formed. Pioneer species (Chenopodiaceae, Artemisia) were the first to colonize the bare zones of the lower and middle marsh areas. In addition, the pollen results revealed that the vegetation in the Shandong Peninsula was dominated by broadleaved trees during the early Holocene (8500–6500 a BP) and by conifers and broadleaved forests in the middle Holocene (6500–3500 a BP), which was followed by an expansion of broadleaved trees (3500–1000 a BP). After 1000 a BP, human impacts are recognized as a sudden decrease in Quercus and a marked increase in secondary vegetation Pinus. The pollen-based temperature index indicated that a warmer early and late Holocene and colder middle Holocene were consistent with previously reported temperature records for North and Northwest China. The main driving factors of temperature variation in this region are insolation, greenhouse gases and the El Niño-Southern Oscillation.

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“…Over the past century, river deltas 20 have changed rapidly, putting these large human populations at risk (Barras et al, 2008;Erban et al, 2014;Wilson et al, 2017;Wu et al, 2017). Monitoring morphologic change on river deltas is key to their sustainable management (Peyronnin et al, 2017).…”

Section: Introductionmentioning

confidence: 99%

Measuring Subaqueous Progradation of the Wax Lake Delta with a Model of Flow Direction Divergence

Shaw¹,

Estep²,

Whaling³

et al. 2018

Preprint

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Abstract.Remotely sensed flow patterns can reveal the location of the subaqueous distal tip of a distributary channel on a prograding river delta. Morphodynamic feedbacks produce distributary channel tips that become shallower over their final reaches before becoming deeper over the unchannelized foreset. The flow direction field over this morphology tends to diverge 10 and then converge providing a diagnostic signature that can be captured in flow or remote sensing data. Twenty-one measurements from the Wax Lake Delta (WLD) in coastal Louisiana, and 317 measurements from numerically simulated deltas show that the transition from divergence to convergence occurs in a distribution that is centered just downstream of the channel tip, on average 132 m in the case of the WLD. With these data we validate the Flow Direction to Channel tips (FD2C) inverse model for remotely estimating subaqueous channel tip location. We apply this model to 33 remotely sensed images of 15 the WLD between its initiation in 1974 and 2016. We find that the distributaries grew unevenly, 6 of the primary channels grew at rates of 60-80 m/yr while one grew at 116 m/yr. We also estimate the growth rate of the total area enclosed by the subaqueous delta platform to be 1.83 km 2 /yr with no obvious rate changes over time.

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Stepwise morphological evolution of the active Yellow River (Huanghe) delta lobe (1976–2013): Dominant roles of riverine discharge and sediment grain size

Cited by 106 publications

References 40 publications

Hydrological controls on the evolution of the Yellow River Delta: An evaluation of the relationship since the Xiaolangdi Reservoir became fully operational

Hydrological controls on the evolution of the Yellow River Delta: An evaluation of the relationship since the Xiaolangdi Reservoir became fully operational

Holocene vegetation dynamics in response to climate change and hydrological processes in the Bohai region

Measuring Subaqueous Progradation of the Wax Lake Delta with a Model of Flow Direction Divergence

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