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Uppermost Subaqueous Soil Variability in Front of the Situk River Inlet, Alaska, from Portable Free Fall Penetrometer
Nearshore areas in front of river inlets feature significant spatial and temporal variations in sediment distribution, transport, and deposition processes. This makes subaqueous sediment characterization of such locations essential for engineering applications and for the fundamental understanding of regional geomorphodynamics. Site investigation was conducted in the nearshore area off the Situk River Inlet, Yakutat, Alaska. This region is characterized by highly variable sediments and energetic wave conditions. In situ tests were conducted along ten cross shore transects with 64 locations in total using a portable free fall penetrometer. The results showed the presence of a loose sediment top layer of 3.8–6.9 cm in thickness overlying a stiffer stratum with a maximum quasi-static bearing capacity ranging from 30–106 kPa at sediment depths of less than 15 cm. More variability in sediment strength was observed with decreasing water depths (approaching the shore), and sediment strength generally somewhat decreased seaward. For transects closer to the inlet, a more distinct trend of decreasing sediment strength with distance to the shore was observed. As expected, the impact of waves on the sediments appeared significant in shallow water depths. The results suggested an influence of hydrodynamics and the presence of the inlet on the topmost sediment layers, and consequently on the geotechnical characteristics.
Uppermost Subaqueous Soil Variability in Front of the Situk River Inlet, Alaska, from Portable Free Fall Penetrometer
Nearshore areas in front of river inlets feature significant spatial and temporal variations in sediment distribution, transport, and deposition processes. This makes subaqueous sediment characterization of such locations essential for engineering applications and for the fundamental understanding of regional geomorphodynamics. Site investigation was conducted in the nearshore area off the Situk River Inlet, Yakutat, Alaska. This region is characterized by highly variable sediments and energetic wave conditions. In situ tests were conducted along ten cross shore transects with 64 locations in total using a portable free fall penetrometer. The results showed the presence of a loose sediment top layer of 3.8–6.9 cm in thickness overlying a stiffer stratum with a maximum quasi-static bearing capacity ranging from 30–106 kPa at sediment depths of less than 15 cm. More variability in sediment strength was observed with decreasing water depths (approaching the shore), and sediment strength generally somewhat decreased seaward. For transects closer to the inlet, a more distinct trend of decreasing sediment strength with distance to the shore was observed. As expected, the impact of waves on the sediments appeared significant in shallow water depths. The results suggested an influence of hydrodynamics and the presence of the inlet on the topmost sediment layers, and consequently on the geotechnical characteristics.
Uppermost Subaqueous Soil Variability in Front of the Situk River Inlet, Alaska, from Portable Free Fall Penetrometer
Kiptoo, Dennis K. (author) / Stark, Nina (author) / Albatal, Ali (author) / Bilici, Cagdas (author)
Eighth International Conference on Case Histories in Geotechnical Engineering ; 2019 ; Philadelphia, Pennsylvania
Geo-Congress 2019 ; 71-80
2019-03-21
Conference paper
Electronic Resource
English
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