Experimental and numerical analysis of velocity distribution in a compound meandering channel with double layered rigid vegetated flood plains

Rao, Pradeep; Prasad, Bijoy; Sharma, Anurag; Khatua, Kishanjit Kumar

doi:10.1016/j.flowmeasinst.2021.102111

Cited by 13 publications

(6 citation statements)

References 31 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Previous studies about the flow and sediment dynamics in curvatures are mainly conducted in ideal environments, such as water tank experiments in laboratory or idealized numerical models (Paiva et al., 2020; Zheng et al., 2022). For example, researchers are interest in the effects of discharges on the velocity and riverbed evolution in a meandering channel (Y. Pan et al., 2022), the effect of vegetation on flow and bed shear stress in bends (Termini, 2016), the influence of curvature ratio and vegetation density on bed shear stress using a partially vegetated U‐bend water tank (M. Wang et al., 2021), and the flow characteristics in curvatures in floodplain with different blocks (Naghavi et al., 2022) or double layered rigid vegetations (Rao et al., 2022). Attentions also have been paid to the impacts of flow/sediment dynamics to meandering/curved channels, through discussing the erosion and deposition of curved channels (Bilal et al., 2021; Blanton et al., 2003; da Silva et al., 2023).…”

Section: Discussionmentioning

confidence: 99%

Positive Feedback Between the Tidal Flat Variations and Sediment Dynamics: An Example Study in the Macro‐Tidal Turbid Hangzhou Bay

Ren

et al. 2023

JGR Oceans

View full text Add to dashboard Cite

Tidal flat variations (curvature) in macro‐tidal turbid bays highly correlate with sediment dynamics. Interactions between tidal flats and sediment dynamics in macro‐tidal turbid estuaries, like Hangzhou Bay, China, have been studied through a fully validated 3D sediment model by considering high‐turbidity, flocculation, and water‐sediment density coupling. Numerical results show that the circulation and sediment flux in the curvature of Andong tidal flat have similar magnitudes in the along‐estuarine and lateral directions, demonstrating the important impact of the geometry on hydrodynamics and sediment transport processes. Sediment moves toward the southern/northern bank near the bottom/surface level in curvature. Tidally averaged net sediment flux is southward in the curvature. Tidal flat reclamation changes the curvature of the tidal channel, and modulates the circulation and sediment transport, and then feeds back to the tidal flat evolution subsequently. Bottom friction, nonlinear advection, and centrifugal force are dominant forces for inducing the lateral circulation, followed by the Coriolis force and sediment‐induced baroclinic process. Lateral circulation combined with the suspended sediment concentration (SSC) profile controls the distribution of instantaneous and tidally averaged net sediment fluxes in the curvature. The sediment flux positively correlates with the curvature of channel bends. The increased curvature of channel bends enhances the southward sediment fluxes mainly by increasing the effects of the centrifugal force, nonlinear advection, and Coriolis force on the lateral circulation and SSC. This study revealed a two‐way feedback system between tidal flat and sediment dynamics, which contributes to the impact of anthropogenic activities on geomorphological evolution of similar estuaries worldwide.

show abstract

Section: Discussionmentioning

confidence: 99%

Positive Feedback Between the Tidal Flat Variations and Sediment Dynamics: An Example Study in the Macro‐Tidal Turbid Hangzhou Bay

Ren

et al. 2023

JGR Oceans

View full text Add to dashboard Cite

show abstract

“…Sifat hidraulik air pada kelokan sungai cenderung bersifat turbulen dan memiliki energi yang lebih besar. Energi aliran pada meander sungai dipengaruhi oleh berbagai faktor seperti topografi, perkerasan saluran, jenis tanah dan vegetasi di sekitar meander [18]. Hal ini menjadi masalah karena terdapat beberapa pemukiman penduduk dan fasilitas umum berada pada daerah meander sungai seperti yang ditunjukkan pada Gambar 9.…”

Section: Gambar 9 Lokasi Potensi Banjirunclassified

Pemodelan Banjir Dua Dimensi Sungai Seruyan dengan Menggunakan Aplikasi HEC-RAS

Bumi,

Rezagama

2023

JIK

View full text Add to dashboard Cite

Banjir tersebut terjadi hingga 4 bulan dan menggenangi sebagian besar kecamatan di Kabupaten Seruyan. Hal ini menyebabkan timbulnya berbagai kerugian jiwa, sosial dan ekonomi. Dampak bencana banjir tersebut dapat dikurangi dengan analisis lokasi yang berpotensi terjadi banjir dan analisis penyebab terjadinya banjir pada daerah tersebut. Analisis dilakukan dengan melakukan pemodelan banjir dua dimensi dengan menggunakan aplikasi HEC-RAS versi 6.1. Pemodelan dilakukan dengan menggunakan data topografi dan hidrograf banjir dengan metode HSS Nakayasu. Data sedimen dan debit dari anak sungai tidak ditambahkan dalam model. Hasil pemodelan menunjukkan terdapat empat lokasi dengan elevasi banjir tertinggi dan area yang luas. Banjir pada lokasi tersebut disebabkan oleh topografi yang rendah, pertemuan beberapa anak sungai dan karakteristik sungai yang berkelok-kelok (meander) sungai. Berdasarkan hal tersebut, maka dapat direncanakan beberapa solusi teknis dan non teknis untuk mengurangi potensi kerugian akibat banjir.

show abstract

“…Several authors claim that the velocity is maximum in the inner flow region (Dietrich et al 1979;De Vriend & Geldof 1983). Various studies in sinusoidal channels with fixed beds and floodplain flows have also been conducted, e.g., Ervine et al (1993), Willetts & Rameshwaran (1996), Shiono & Muto (1998), Shiono et al (2008), Rao et al (2022) and Spooner & Shiono (2003). They analysed different flow characteristics such as secondary flow, turbulence, as well as the expansion and contraction of the flow in a main channel.…”

Section: Introductionmentioning

confidence: 99%

Turbulent flow mechanisms in meandering channels with sediment transport

Sahoo

Sharma

2023

Water Practice and Technology

View full text Add to dashboard Cite

This research aims to investigate the near-bed turbulent flow characteristics in a meandering channel with both mobile bed and immobile bed conditions. Experiments were performed in a prismatic rectangular meandering channel with a non-uniform sand bed of size d50 = 0.523mm. The three-dimensional instantaneous fluid velocity was collected using the Acoustic Doppler velocimeter which will provide important results related to the flow turbulence such as mean flow velocity, turbulence intensity, Reynolds shear stress, turbulent kinetic energy, skewness, kurtosis and turbulent anisotropy. The secondary current flow and the exchange of momentum in the form of turbulence kinetic energy, Reynolds shear stress and turbulent intensity at the inner layer of the flow are identified more in a mobile bed condition as compared to an immobile condition, which causes sediment transport. For the inner layer of the flow, turbulence intensity and turbulent kinetic energy are decreased in magnitude and gradually increase in the outer layer of flow for both the bed conditions. Higher turbulence anisotropy is noticed in the mobile bed condition than in the immobile bed condition, which shows more nonuniformities near the bed level for the mobile bed condition. This study may help in understanding the effect of sediment transport due to a turbulent flow structure in a sinuous alluvial channel.

show abstract

Experimental and numerical analysis of velocity distribution in a compound meandering channel with double layered rigid vegetated flood plains

Cited by 13 publications

References 31 publications

Positive Feedback Between the Tidal Flat Variations and Sediment Dynamics: An Example Study in the Macro‐Tidal Turbid Hangzhou Bay

Positive Feedback Between the Tidal Flat Variations and Sediment Dynamics: An Example Study in the Macro‐Tidal Turbid Hangzhou Bay

Pemodelan Banjir Dua Dimensi Sungai Seruyan dengan Menggunakan Aplikasi HEC-RAS

Turbulent flow mechanisms in meandering channels with sediment transport

Contact Info

Product

Resources

About