

FOLLOWUS
1. First Institute of Oceanography, Ministry of Natural Resources, Qingdao 266061, China
2. Key Laboratory of Coastal Science and Integrated Management of Oceanography, Ministry of Natural Resources, Qingdao 266061, China
lp@fio.org.cn
Received:31 July 2022,
Accepted:13 September 2022,
Online First:28 October 2022,
Published:01 November 2023
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LI Ping,JIN Yongde,GAO Wei,et al.Spatial differentiation and dynamic mechanism of micro-geomorphology based on acoustic spectrum data of the Huanghe (Yellow) River Delta[J].Journal of Oceanology and Limnology,2023,41(06):2077-2089.
Submarine micro-geomorphology is a geo-morphological type occurring in shallow and surface areas of seabed. The combined relationships and distribution of the micro-geomorphology indirectly reflect coupling relationships among the sediment deposition
dynamic environment
and geomorphologic evolution. Spatial differentiation and dynamic changes in micro-geomorphology were studied based on acoustic data interpretation from a wide range (3 200 km
2
) of the Huanghe (Yellow) River delta (HRD). The combination of the sub-bottom profiler and the side-scan sonar methods allowed for the identification of submarine shallow micro-geomorphologic types
as well as their scale and spatial distributions. There were seven typical micro-geomorphologic features in the shallow and surface areas of the HRD
including buried ancient channels
stratigraphic disturbances
scour troughs
sand waves
pits
erosional remnants
and sand spots. The coupling and superposition of the sediment
sediment characteristics
seabed scouring and silting
and hydrodynamic conditions of the Huanghe River had combined effects on the patterns of micro-geomorphologic types
characteristics
and ranges. From the perspective of acoustic profile interpretations
the scale
range
and spatial locations of the micro-geomorphology in the HRD revealed seasonal variation characteristics
and the spatial distributions displayed significant regional differentiation characteristics. In addition
strong stra
tigraphic disturbances and areas with densely distributed buried ancient channels reflected the activity and instability of the submarine shallow strata. Through the interpretation of the sub-bottom profile detection data
the diversion processes of the flow paths in the lower reaches of the Huanghe River were obtained for a certain historical period in the coastal waters of the HRD. This study further clarified the relationships between the micro-geomorphologic features and spatial combinations
which is important for research on micro-geomorphologic features and their dynamic mechanisms.
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