Modeling sorting dynamics of cohesive and non-cohesive sediments on intertidal flats under the effect of tides and wind waves

Zhou, Zeng; Coco, Giovanni; Wegen, Mick van der; Gong, Zheng; Zhang, Changkuan; Townend, Ian

doi:10.1016/j.csr.2015.05.010

Cited by 58 publications

(47 citation statements)

References 63 publications

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“…More recently, Maan et al (2015) suggested the possibility that mudflats under crossshore tidal forcing, either prograde or retreat while maintaining a migrating, several kilometres long, equilibrium profile shape. Zhou et al (2015aZhou et al ( , 2016 explored the impact of grain sorting and consolidation on mudflat morphodynamics, while Marani et al (2007), Mariotti and Fagherazzi (2010) and Zhou et al (2015b) provide examples on the impact of vegetation and its feedback on morphodynamics.…”

Section: Introduction Frameworkmentioning

confidence: 99%

Mudflat Morphodynamics and the Impact of Sea Level Rise in South San Francisco Bay

Wegen

Jaffe

Foxgrover

et al. 2016

Estuaries and Coasts

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Estuarine tidal mudflats form unique habitats and maintain valuable ecosystems. Historic measurements of a mudflat in San Fancsico Bay over the past 150 years suggest the development of a rather stable mudflat profile. This raises questions on its origin and governing processes as well as on the mudflats' fate under scenarios of sea level rise and decreasing sediment supply. We developed a 1D morphodynamic profile model (Delft3D) that is able to reproduce the 2011 measured mudflat profile. The main, schematised, forcings of the model are a constant tidal cycle and constant wave action. The model shows that wave action suspends sediment that is transported landward during flood. A depositional front moves landward until landward bed levels are high enough to carry an equal amount of sediment back during ebb. This implies that, similar to observations, the critical shear stress for erosion is regularly exceeded during the tidal cycle and that modelled equilibrium conditions include high suspended sediment concentrations at the mudflat. Shear stresses are highest during low water, while shear stresses are lower than critical (and highest at the landward end) along the mudflat during high water. Scenarios of sea level rise and decreasing sediment supply drown the mudflat. In addition, the mudflat becomes more prone to channel incision because landward accumulation is hampered. This research suggests that sea level rise is a serious threat to the presence of many estuarine intertidal mudflats, adjacent salt marshes and their associated ecological values.

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Section: Introduction Frameworkmentioning

confidence: 99%

Mudflat Morphodynamics and the Impact of Sea Level Rise in South San Francisco Bay

Wegen

Jaffe

Foxgrover

et al. 2016

Estuaries and Coasts

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“…Attention is drown towards cohesive sediment because mud distributes more landwards and sand more seawards (Zhou et al, 2015). The examples include cases in Wash bay, UK (Amos, 1995), Jade bay, Germany (Frienrichs, 2014).…”

Section: Sedimentationmentioning

confidence: 99%

Numerical modelling approach for the management of seasonal influenced river channel entrance

Tay

Mitchell

Chen

et al. 2016

Ocean & Coastal Management

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a b s t r a c tThe dynamic nature of a river channel entrance is commonly seasonal dependant. This is evidenced in the topography of river channel entrances in East Coast of Borneo which is influenced by both North East (NE) and South West (SW) monsoons on top of surrounding parameters such as waves and tides, sedimentation as well as climate change. Advanced numerical modelling technique is frequently used as a leading approach to investigate the complicated nature of river channel entrance to well represent actual conditions of a designated area. This paper presented a mesoscale numerical modelling method by integrating reductionist and reduced complexity model approach along with local seasonal conditions to well represent river channel entrance problem and propose management measures. The model was established with a set of numerical equilibrium equations and calibrated parameters to reflect the features of regional conditions with the combination of local validated modelling parameters. The model had accurately represented the effects of both NE and SW monsoons in terms of hydraulics and sediment dynamics at the Petagas river channel entrance, as verified by site data and satellite imagery. In addition, the accuracy of the model provides confidence in the implementation of improvement measures at the river channel entrance. The improvement scheme includes a training channel and a breakwater in improving flushing capacity, thus preventing sedimentation and upstream flooding, allowing proper navigation through the river. In conclusion, the accurate investigational result from this numerical model had successfully demonstrated its scientific role in solving dynamic river channel entrance, which can serve as a numerical modelling approach for solving similar river channel entrance problems especially in the East Coast of Borneo with predominant inter-annual seasonal variations.

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“…Transpor sedimen kohesif bergantung pada pergerakan massa air yang diakibatkan oleh pasang surut, arus, gelombang dan debit sungai (Zhou et al, 2015). Xue et al (2012) mengemukakan penyebab utama transpor dan deposit sedimen yang membentuk delta pada muara Sungai Mekong (sungai terbesar di Asia Tenggara) adalah pasang surut, arus dan gelombang.…”

Section: Pendahuluanunclassified

Cohesive Sediment Transport Modeling on Inner Ambon Bay

Noya¹,

Purba²,

Koropitan³

et al. 2017

J. Ilmu dan Teknologi Kelautan Tropis

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ABSTRAKAdanya sedimen kohesif di perairan dapat mengurangi penetrasi cahaya ke dalam air dan fotosintesis sehingga produktifitas primer perairan dapat terganggu. Pengendapan sedimen kohesif di perairan pesisir dapat mengakibatkan sedimentasi. Tujuan peneltian ini menunjukkan pola sebaran sedimen kohesif dan hubungannya dengan sedimentasi yang terjadi di Teluk Ambon Dalam (TAD). Pemodelan menggunakan MIKE 3 FM untuk menginterpretasikan proses sedimentasi pada TAD. Pengerjaan pemodelan dibagi menjadi 2 tahap yaitu pemodelan hidrodinamika (baroclinic) dan transport sedimen (sedimen transport). Hasil model menunjukkan bahwa pola pergerakan arus yang terjadi pada perairan TAD dipengaruhi oleh faktor pasang surut. Pola penyebaran sedimen kohesif secara vertikal mulai dari permukaan sampai dengan kedalaman 30m sekitar 3,5-15 Kg/m 3 . Konsentrasi sedimen kohesif tertinggi terjadi pada pangkal teluk (di sekitar Waiheru, Passo, dan Lateri). Hasil simulasi model selama 30 hari menunjukan bahwa tingkat erosi pada ambang (sill) berkisar antara 1,04-6,15 Kg/m 2 /s, sedangkan pada TAD hanya terjadi pada stasiun T1 yaitu 9,07x10 -8 Kg/m 2 /s. Sedimentasi yang berhubungan akumulasi sedimen kohesif ditunjukan oleh ketebalan lapisan (bed level). Ketebalan lapisan sedimen pada area ambang yaitu 0,01-0,19 cm atau rata-rata 0,47 mm/hari, sedangkan pada TAD berkisar antara 1,75-10,01 cm, atau dengan nilai rata-rata sekitar 39,9 mm/hari.

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Modeling sorting dynamics of cohesive and non-cohesive sediments on intertidal flats under the effect of tides and wind waves

Cited by 58 publications

References 63 publications

Mudflat Morphodynamics and the Impact of Sea Level Rise in South San Francisco Bay

Mudflat Morphodynamics and the Impact of Sea Level Rise in South San Francisco Bay

Numerical modelling approach for the management of seasonal influenced river channel entrance

Cohesive Sediment Transport Modeling on Inner Ambon Bay

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