Modeling Study on the Hydrodynamic Environmental Impact Caused by the Sea for Regional Construction near the Yanwo Island in Zhoushan, China

He Gou,Ruijie Li,Xiaotian Dong,Feng Luo,Yifeng Zhang

doi:10.3390/w11081674

Abstract

Waves are one of the most important factors affecting offshore marine engineering. Accurate calculation of wave distribution is an important prerequisite to ensure the safety of coastal engineering construction. Due to the influence of complex topography, hydrological conditions, and marine structures on the propagation of waves offshore, slowly varying topography, refraction, diffraction, reflection, shallowness, and other phenomena may occur. This article combines the MIKE21 Spetral Waves (SW) wave model and the MIKE21 Boussinesq Waves (BW) wave model which are developed by Danish Hydraulic Institute (DHI) for a joint application (SW–BW nested model). It simulates the hydrodynamic environment of the Yanwo Island scenic area, located in Zhoushan, in both large and small ranges. In addition, wave height distribution and berthing stability of different breakwater planning schemes are calculated to optimize the layout of the breakwater. Through the analysis of simulation results, it is concluded that the hydraulic performance of Scheme 2 (the broken line section on the west side is 100 m long, and that on the east is 1200 m long, and the breakwater is rotated 8 degrees counterclockwise along the axis on the basis of Scheme 1) is better than that of Scheme 1 (the broken line section on the west side is 100 m long, and that on the east is 1100 m long), which can provide a more reliable construction reference for the construction of the Yanwo Island scenic area.

Highlights

It is of great theoretical significance and application value to study the motion law of waves, especially for shipping, port, and ocean engineering
It can be seen from the verification chart that the measured values and calculated values of significant wave height generated by sea breeze and land breeze have a high coincidence, respectively, the calculated value of significant wave period is slightly larger than the measured value but Verification of Wave Period (Ts)
It can be seen from the verification chart that the measured values and calculated values of significant wavegenerated height generated sea breeze and land have a high coincidence, respectively, The waves by sea by breeze are large, and dissipate and attenuate continuously after large, and breeze dissipate attenuate,the thecalculated calculated value of significant wave period is slightly larger than the measured value entering region from the incident boundary

Summary

Introduction

It is of great theoretical significance and application value to study the motion law of waves, especially for shipping, port, and ocean engineering. The main mathematical models for studying waves are plane two-dimensional wave models, vertical two-dimensional wave models, and three-dimensional wave models [1,2]. According to different control equations, the plane two-dimensional wave theory can be divided into the energy balance equation model, mild-slope equation model, Boussinesq equation model, and Navier–Stokes equation model [4,5,6]. The energy balance equation model, which is based on the principle of conservation of energy, is currently in the third generation [7,8,9]. It can depict the generation, growth, and attenuation of wind waves by calculating spatial distribution of

Methods

Results

Conclusion