Journal of Tropical Oceanography >
Study on beach response to Typhoon Khanun (No. 1720) along southern Leizhou Peninsula
Received date: 2018-03-06
Request revised date: 2018-06-07
Online published: 2019-01-16
Supported by
National Natural Science Foundation of China (41676079)
Project of Enhancing School With Innovation of Guangdong Ocean University (Q18307)
Strategic Priority Research Program of Chinese Academy of Sciences (XDA13010103)
Copyright
Observations and research on beach responses to storms help deepen our understanding of beach processes. Typhoon Khanun (No. 1720) made landfall in Xuwen, Guangdong on October 16, 2017. The typhoon caused significant impacts on the beaches along the southern Leizhou Peninsula. Based on the field profile survey and sediment sampling before and after the typhoon landfall, beach response characteristics are investigated in this study. The main results show the following. (1) Under extreme wave conditions, the surface sediment became coarser and the sorting was worse. Beach states transformed toward more dispersed states to buffer and adapt to the high intensity wave energy. (2) Beaches and different segments in the same beach had different responses. These differences were influenced by the headlands, bays’ orientations and sizes. Submarine bar or beach berm may occur on the beach profile. Attention should be paid to the roles of geological and geomorphologic factors when studying beach responses to storms. (3) Changes of the Dengloujiao Beach were influenced by the reef flat and the huge sandy headland. The beach response of beach-coral reef flat system to storm needs further study. More detailed observations and studies of beach responses to storms are needed in the future.
Key words: Leizhou Peninsula; typhoon; beach response; beach profile; morphodynamic state
ZHU Shibing , LI Zhiqiang . Study on beach response to Typhoon Khanun (No. 1720) along southern Leizhou Peninsula[J]. Journal of Tropical Oceanography, 2019 , 38(1) : 96 -104 . DOI: 10.11978/2018024
Fig. 1 Typhoon path and study area (T1-T10 are profiles)图1 台风路径及研究区位置图(T1—T10为剖面位置) |
Tab. 1 Meteorological data during Typhoon Khanun表1 台风“卡努”经过琼州海峡时气象数据 |
时刻 | 中心位置 | 最大风速/(m·s-1) | 中心气压/hPa | 移动速度/(km·h-1) | 移动方向 | 7级风圈半径/km |
---|---|---|---|---|---|---|
2017-10-15T22:00 | 111.6°E, 20.6°N | 38 | 965 | 20 | W | 280 |
2017-10-15T23:00 | 111.4°E, 20.6°N | 35 | 970 | 20 | WWS | 200 |
2017-10-16T00:00 | 111.1°E, 20.6°N | 33 | 975 | 20 | WWS | 180 |
2017-10-16T01:00 | 110.9°E, 20.7°N | 30 | 980 | 20 | WWS | 180 |
2017-10-16T02:00 | 110.7°E, 20.7°N | 28 | 985 | 20 | W | 180 |
2017-10-16T03:00 | 110.5°E, 20.6°N | 28 | 985 | 20 | W | 180 |
2017-10-16T04:00 | 110.3°E, 20.6°N | 25 | 990 | 15 | WWS |
注: 数据来自中国天气台风网, http://typhoon.weather.com.cn。 |
Tab. 2 Wave heights in the Qiongzhou Strait during Typhoon Khanun. Units: m表2 台风“卡努”过境期间研究区域附近波高情况(单位: m) |
北部湾 | 琼州海峡 | 雷州半岛东部 | |
---|---|---|---|
2017-10-13 | 1.8~2.3 | 1.8~2.3 | 2.5~3.5 |
2017-10-14 | 2.0~2.5 | 2.0~2.5 | 3.0~4.0 |
2017-10-15 | 2.0~2.8 | 2.0~2.8 | 7.0~10.0 |
2017-10-16 | 5.0~7.0 | 5.0~7.0 | 7.0~10.0 |
2017-10-17 | 2.0~3.0 | 1.8~2.3 | 1.8~2.3 |
Fig. 2 Beach profiles before and after Typhoon Khanun. HTL: High tidal level; LTL: low tidal level图2 台风前后各海滩剖面变化 |
Tab. 3 Characteristic parameters of surface sediments before and after Typhoon Khanun表3 台风前后表层沉积物特征参数 |
剖面 | Md | QD | SK | MO | ||||||||
---|---|---|---|---|---|---|---|---|---|---|---|---|
前 | 后 | ΔMd | 前 | 后 | ΔQD | 前 | 后 | ΔSK | 前 | 后 | ΔMO | |
T1 | 2.11 | 1.96 | -0.15 | 3.84 | 5.03 | +1.19 | -0.04 | -0.15 | -0.11 | 0.07 | 0.08 | +0.01 |
T2 | 1.99 | 2.18 | +0.19 | 2.55 | 6.30 | +3.75 | -0.12 | -0.37 | -0.25 | 0.08 | 0.25 | +0.17 |
T3 | 2.50 | 2.52 | +0.02 | 2.69 | 2.55 | -0.13 | -0.28 | -0.12 | +0.16 | 0.25 | 0.17 | -0.07 |
T4 | 2.51 | 2.52 | +0.01 | 2.37 | 2.41 | +0.04 | -0.14 | -0.06 | +0.08 | 0.21 | 0.12 | -0.09 |
T5 | 2.46 | 2.51 | +0.05 | 1.98 | 2.40 | +0.42 | -0.18 | -0.19 | -0.01 | 0.15 | 0.22 | +0.07 |
T6 | 2.52 | 2.57 | +0.05 | 4.30 | 2.39 | -1.91 | -0.34 | -0.20 | +0.13 | 0.26 | 0.17 | -0.09 |
T7 | 2.51 | 2.54 | +0.03 | 3.20 | 2.74 | -0.46 | -0.15 | -0.21 | -0.06 | 0.13 | 0.21 | +0.08 |
T8 | 2.58 | 2.50 | -0.07 | 3.44 | 3.00 | -0.44 | -0.18 | -0.09 | +0.09 | 0.18 | 0.11 | -0.07 |
T9 | 2.31 | 2.98 | +0.68 | 3.98 | 6.20 | +2.22 | -0.03 | -0.16 | -0.13 | 0.09 | 0.04 | -0.05 |
T10 | 2.71 | 3.02 | +0.31 | 3.31 | 7.25 | +3.94 | -0.24 | -0.15 | +0.09 | 0.19 | 0.06 | -0.12 |
Tab. 4 Beach states before and after Typhoon Khanun表4 台风前后海滩状态类型 |
剖 面 | |||||||||||
---|---|---|---|---|---|---|---|---|---|---|---|
T1 | T2 | T3 | T4 | T5 | T6 | T7 | T8 | T9 | T10 | ||
台风前 | Ω | 1.53 | 0.39 | 3.78 | 4.78 | 6.24 | 25.41 | 25.42 | 20.26 | 11.76 | 22.38 |
海滩状态 | 过渡 | 反射 | 过渡 | 过渡 | 消散 | 消散 | 消散 | 消散 | 消散 | 消散 | |
台风后 | Ω | 2.3 | 3.43 | 19.46 | 20.68 | 20.36 | 34.93 | 27.24 | 27.04 | 28.64 | 32.69 |
海滩状态 | 过渡 | 过渡 | 消散 | 消散 | 消散 | 消散 | 消散 | 消散 | 消散 | 消散 |
The authors have declared that no competing interests exist.
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