洋山港海域一次冷锋型温带风暴潮特征及各影响因子贡献的对比分析

doi:10.11978/2021152

Abstract

Abstract:

In this paper, an extra-tropical storm surge in the Yangshan Port (YSP) and its coastal area caused by a strong cold front on 29th December, 2020 was investigated. Meteorological observation data was analyzed to study the development of the weather system. FVCOM-SWAVE model characterized by a high-resolution unstructured-grid with 10 m was used to simulate the storm surge. The observed tide data, wave data and current data were introduced to verify the result of simulation, and the result was proved to be accurate and credible. Maximum storm surge, maximum negative storm surge, current, total water level and wave were studied to describe the character of the extra-tropical storm surge of YSP and its coastal area. Finally, sensitive experiments were carried out to compare the contributions of mean sea level pressure (SLP), wind and wave to the maximum storm surge. The main conclusions can be summarized as follows: 1) affected by the topography of the channel, the main component of the tidal current was southeast or northwest, which was approximately parallel to the shoreline, the current velocity in the deep water channel of YSP was the highest with a value between 2.6~2.8 m·s^-1; 2) due to the influence of long term northerly gale and high SLP, the storm surge behave as a characteristics of short-term positive storm surge and long-term negative storm surge; 3) during the peak period of storm surge, the contribution of wind field to storm surge was ~ 90%, and the contribution of sea-level pressure field was approximately 5%; while during the peak period of negative storm surge, the contribution of sea-level pressure field was about 55%, the contribution of wind field was ~ 40%, In addition, the contribution of wave to both was less than 10%.

Key words: FVCOM-SWAVE, extra-tropical storm surge, Yangshan Port adjacent area

CLC Number:

P731.23

XU Jie, GUO Jibing, CHEN Zhiqiang, ZHU Zhihui, WANG Qin, TANG Yanling. Comparative study on the contribution of various influential factors and characteristics analysis of an extra-tropical storm surge caused by cold front in the Yangshan Port and its adjacent area[J].Journal of Tropical Oceanography, 2022, 41(4): 126-135.

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References 20

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模型参数	参数配置
网格范围	120°—123°18′E, 29°12′— 32°12′N
分辨率	最大网格9km, 最小网格10m
节点/单元	节点148375个, 三角形单元286204个
垂向分层	10层
积分时间	2020年12月24日0000UTC—2021年1月2日0000UTC
FVCOM时间步长	内模2s, 外模0.2s, 时间分裂模比10
SWAVE时间步长	2s
谱方向分辨率	10°
边界海浪谱型	JONSWAP
边界径流	大通、富春江水文站径流量
边界水位	TPXO模型模拟输出的M2、S2、K1、O1、N2、P1、Q1、K2
初始条件	冷启动(温度10℃; 盐度30‰)
风场	WARMS2.1数据集10m风场的U、V分量(水平分辨率9km)
气压场	WARMS2.1海平面气压数据

要素	CASE0	CASE1	CASE2	CASE3	Control
潮位	√	√	√	√	√
海平面气压场		√		√	√
风场			√	√	√
波浪					√

站点 (要素)	长江口灯船 (有效波高)	海礁浮标 (有效波高)	南港验潮站 (水位)	东海大桥北浮标 (流向)	东海大桥北浮标 (流速)
平均绝对误差	0.19m	0.21m	0.28m	12.57°	0.24m•s^-1
均方根误差	0.23m	0.25m	0.34m	17.18°	0.30m•s^-1

Comparative study on the contribution of various influential factors and characteristics analysis of an extra-tropical storm surge caused by cold front in the Yangshan Port and its adjacent area

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