Journal of Geographical Sciences ›› 2020, Vol. 30 ›› Issue (7): 1179-1194.doi: 10.1007/s11442-020-1776-x
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DING Yuanting1(), YU Jitao2,*(
), CHENG Huangxin3
Received:
2019-03-21
Accepted:
2019-09-09
Online:
2020-07-25
Published:
2020-09-25
Contact:
YU Jitao
E-mail:ddyjt @163.com
About author:
Ding Yuanting, PhD, specialized in coastal environment. E-mail: Supported by:
DING Yuanting, YU Jitao, CHENG Huangxin. Beach morphodynamic characteristics and classifications on the straight coastal sectors in the west Guangdong[J].Journal of Geographical Sciences, 2020, 30(7): 1179-1194.
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Figure 1
The study area showing 12 studied headland-bay beaches and wave and tide data sources in the west Guangdong. The beaches include #1-Jizhao Bay (21.392°-21.392°N, 110.847°-110.853°E), #2-Wangcun Bay (21.388°-21.418°N, 110.891°-110.929°E), #3-Aonei Bay (21.418°-21.429°N, 110.958°-110.982°E), #4- Shuidong Bay (21.429°-21.459°N, 110.997°-111.053°E), #5-Shuidong Dong (21.460°-21.469°N, 111.102°- 111.128°E), #6-Bohe Bay (21.464°-21.481°N, 111.136°-111.199°E), #7-Fuhu Bay (21.507°-21.525°N, 111.489°-111.527°E), #8-Hebei Bay (21.512°-21.534°N, 111.554°-111.598°E), #9-Hailing Bay (21.593°- 21.618°N, 111.690°-111.751°E), #10-Shili Beach (21.579°-21.604°N, 111.877°-111.911°E), #11-Dongdao Beach (21.618°-21.624°N, 111.982°-111.996°E) and #12-Sanya Bay (21.787°-21.807°N, 112.087°-112.12856°E)."
Table 1
Actual beach morphodynamic type diagnoses based on sediment characteristics, intertidal gradient, breaker type, characteristic morphology and dominant process"
Reflective | Intermediate | Non-barred dissipative | |
---|---|---|---|
Beach sites | Dongdao Beach | Bohe Bay, Fuhu Bay, Hebei Bay, Shili Beach, Sanya Bay | Jizhao Bay, Wangcun Bay, Aonei Bay, Shuidong Bay, Shuidong Dong, Hailing Bay |
Sand characteristics | Coarse sand | Mainly medium sand | Fine sand |
Intertidal gradient | Steep (>10°) | Steeper on the upper beach (6°-10°) and moderately steep on the lower beach (3°-6°) | Moderately steep on the upper beach (3°-5°) and flat on the lower beach (1°-2°) |
Breaker types | Plunging breakers | Plunging breakers | Plunging breakers during high tide, spilling breakers during low tide |
Characteristic morphology | Swash cusps and berm | Rip/bar morphology | Concave profile, featureless morphology |
Dominant process | Swash zone/surf zone | Surf zone | Surf zone/shoaling |
Figure 7
Prediction of beach morphodynamic types (R: reflective; B: barred; BD: barred dissipative; LTT+R: low tide terrace with rip; LTBR: low tide bar or rip; NBD: non-barred dissipative) within the beach morphodynamic framework based on the dimensionless fall velocity parameter (?) and relatively tidal range parameter (RTR). The marker sizes represent the relative gradients of the upper intertidal profiles and the right color bar reflects the absolute wave energy level for 12 studied beaches (1: Jizhao Bay; 2: Wangcun Bay; 3: Aonei Bay; 4: Shuidong Bay; 5: Shuidong Dong; 6: Bohe Bay; 7: Fuhu Bay; 8: Hebei Bay; 9: Hailing Bay; 10: Shili Beach; 11: Dongdao Beach; 12: Sanya Bay)."
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