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Remote Sensing for Natural Resources    2022, Vol. 34 Issue (1) : 27-33     DOI: 10.6046/zrzyyg.2021451
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Detection and assessment of the physical state of offshore artificial reefs
LI Dong1,2,3(), TANG Cheng1,2,3, ZOU Tao2, HOU Xiyong1,2,3()
1. Key Laboratory of Coastal Zone Environmental Processes and Ecological Remediation, Chinese Academy of Sciences Yantai Institute of Coastal Zone Research, Chinese Academy of Sciences, Yantai 264003, China
2. Yantai Institute of Coastal Zone Research, Chinese Academy of Sciences, Yantai 264003, China
3. Ocean Mega-Science Center, Chinese Academy of Sciences, Qingdao 266071, China
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Abstract  

Mastering the subaqueous physical state of artificial reefs (ARs) is critical for assessing the benefits of ARs. Tradition survey methods suffer shortcomings such as low efficiency and incomplete information and cannot meet the requirements for the precise monitoring of ARs. This study established a high-precision DEM (digital elevation model) of ARs using a multibeam sonar system. Meanwhile, this study conducted a quantitative analysis of the distribution, height, volume, and complex topographic features of ARs using the GIS (geographic information system) spatial analysis method. The high-precision DEM was tested in an offshore AR area in Shandong Province, obtaining the following results. The AR area has a water depth of -9.92~-6.73 m. The ARs in the area are stacked in piles with different distances, with a total reef volume of 5 458.49 m3. Meanwhile, 50% of the ARs have a height of 1.48~1.82 m. The terrain characteristic variables such as slope, curvature, rugosity, and topographic relief intensively show high values in the reef distribution area. Affected by their own gravity and local hydrodynamic force, the ARs have a subsidence depth of about 0.5 m, leading to the formation of the special erosion and silting terrain around the ARs. This study can provide technical and data support for the monitoring and assessing the physical stability of ARs and thus is practically significant.
Keywords artificial reef (AR)      physical stability      multibeam sonar      GIS spatial analysis     
ZTFLH:  S953.1P748  
Corresponding Authors: HOU Xiyong     E-mail: dli@yic.ac.cn;xyhou@yic.ac.cn
Issue Date: 14 March 2022
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Dong LI
Cheng TANG
Tao ZOU
Xiyong HOU
Cite this article:   
Dong LI,Cheng TANG,Tao ZOU, et al. Detection and assessment of the physical state of offshore artificial reefs[J]. Remote Sensing for Natural Resources, 2022, 34(1): 27-33.
URL:  
https://www.gtzyyg.com/EN/10.6046/zrzyyg.2021451     OR     https://www.gtzyyg.com/EN/Y2022/V34/I1/27
Fig.1  Working principle and schematic diagram of multi-beam sonar
Fig.3  Comparison of depth profile between reef-free and reef area
Fig.4  Three-dimensional topography and water depth profile of the reef
Fig.5  Variable terrain features of artificial reef area
Fig.6  Slope statistics of artificial reef area
Fig.7  Artificial reef patch extraction
Fig.8  Artificial reef height statistics
编号 斑块面积
/m2		 最大水深
/m		 最小水深
/m		 平均水深
/m		 空方量
/m3
1 69.2 -9.50 -7.91 -8.82 46.92
2 52.16 -9.46 -7.85 -8.71 39.33
3 65.16 -9.39 -8.02 -8.77 40.16
4 140.76 -9.92 -7.81 -8.75 164.16
… … … … … …
44 50.96 -9.49 -7.98 -8.73 38.17
45 72.92 -9.60 -7.78 -8.95 47.44
46 79.84 -9.39 -7.78 -8.73 52.66
… … … … … …
88 40.48 -9.34 -8.28 -8.93 16.64
89 42.92 -9.58 -8.75 -9.38 8.33
合计 — — — — 5 458.49
Tab.1  Statisctics of some artificial reef patches
Fig.2  DEM data of artificial reefs study area
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