Subaqueous Sediment Characterization near Oyster Colonies by Means of Side-Scan Sonar Imaging and Portable Free-Fall Penetrometer

Subaqueous Sediment Characterization near Oyster Colonies by Means of Side-Scan Sonar Imaging and Portable Free-Fall Penetrometer
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通过侧扫描声纳成像和便携式自由落体贯入仪对牡蛎群附近的水下沉积物进行表征

DOI:
10.1061/9780784482810.074
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发表时间:
2020
期刊:
Geo-Congress 2020: Geotechnical Earthquake Engineering and Special Topics
影响因子:
--
通讯作者:
Thomas, Melody
Thomas, Melody
中科院分区:
--
文献类型:
--
作者:
Consolvo, Samuel;Stark, Nina;Castro-Bolinaga, Celso;Massey, Grace;Hall, Steven;Campbell, Matthew;Thomas, Melody

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双壳类群落正在探索其对减轻侵蚀和冲刷的潜在贡献。作为实现这一目标的第一步,在弗吉尼亚州的Piankatank河牡蛎礁周围的潮汐河床的原位条件进行了调查,使用旋转侧扫声纳(SSS)和便携式自由落体流速仪(PFFP),以及其他方法。实地调查于2018年10月4日和5日在牡蛎礁附近半径约300米的区域进行。SSS结果显示牡蛎礁所在地的后向散射强度的标准差显著增加(>20%),表明表面粗糙度增加。PFFP的结果表明,随着离牡蛎礁的距离增加,原位峰值摩擦角有所增加。这种相关性可以用牡蛎礁附近锋利的牡蛎壳碎片的预期增加来解释。因此,SSS提供了清晰的成像和牡蛎礁表面粗糙度增加的措施,而PFFP提供了深入了解沉积物行为的变化,在河床周围的珊瑚礁。
Bivalve colonies are being explored regarding their potential contribution to erosion and scour mitigation. As a first step toward this goal, the in situ conditions of a tidal riverbed around an oyster reef in the Piankatank River in Virginia were investigated using a rotary side-scan sonar (SSS) and a portable free-fall penetrometer (PFFP), among other methods. The field survey was performed on October 4 and 5, 2018, in an area with a radius of approximately 300 meters in the direct vicinity of an oyster reef. The SSS results showed a significant increase (>20%) in the standard deviation of the backscatter intensity where the oyster reef was located, indicating an increased surface roughness. The PFFP results suggested somewhat of an increase of in situ peak friction angles with increasing proximity to the oyster reef. This correlation can be explained by an expected increase in sharp oyster shell fragments near the oyster reef. Thus, the SSS offered clear imaging and a measure of increased surface roughness of the oyster reef, while the PFFP provided insights into changes in sediment behavior in the riverbed surrounding the reef.
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