Numerical Simulation of Curved Channel Circulation in the Qiantang River Estuary Based on SCHISM

HUANG Zi-han; CHENG Wen-long; LI Zhi-yong; ZHU Run-ye; ZHANG Zhi-yong; CHEN Fu-yuan

doi:10.11988/ckyyb.20250465

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Journal of Changjiang River Scientific Research Institute ›› 2025 DOI: 10.11988/ckyyb.20250465

Numerical Simulation of Curved Channel Circulation in the Qiantang River Estuary Based on SCHISM

HUANG Zi-han ¹ ,
CHENG Wen-long ¹^,² ,
LI Zhi-yong ¹ ,
ZHU Run-ye ¹ ,
ZHANG Zhi-yong ¹^,² ,
CHEN Fu-yuan ¹^,²

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Abstract

To investigate the circulation patterns in curved channels of macrotidal estuaries, a three-dimensional hydrodynamic model of the Wenyan reach in the Qiantang River Estuary was established using SCHISM. The temporal and spatial distributions of longitudinal velocity, transverse water surface slope, and circulation intensity in the Wenyan bend were simulated and analyzed during both flood and tidal periods. The computational efficiency of the curved-channel circulation model was also evaluated. The results demonstrate that SCHISM exhibits good applicability and high efficiency in simulating flow in curved channels of macrotidal estuaries. The transverse slope in the bend varies significantly with tidal fluctuations during flood tide, showing a bimodal pattern, Whereas its variation is relatively mild during ebb tide, with the maximum transverse slope being significantly smaller than that during flood tide. The circulation intensity is higher near the bend apex and decreases toward both ends. Under typical conditions, both the transverse slope and circulation intensity in the bend are primarily governed by tidal dynamics.

Key words

Qiantang River estuary / bend / lateral slope / secondary flow intensity / SCHISM

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HUANG Zi-han , CHENG Wen-long , LI Zhi-yong , et al . Numerical Simulation of Curved Channel Circulation in the Qiantang River Estuary Based on SCHISM[J]. Journal of Changjiang River Scientific Research Institute. 2025 https://doi.org/10.11988/ckyyb.20250465

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