New insights into factors controlling the underground drainage of South Supramonte (Sardinia, Italy) from dye-tracing tests

2015 ◽  
Vol 35 ◽  
pp. 260-263 ◽  
Author(s):  
Laura Sanna ◽  
Salvatore Cabras
Keyword(s):  
Dye Tracing

Shape Effect of Polymetallic Nodules on Suction Forces and Flow Field During Seabed Hydraulic Collection

2021 ◽  
pp. 1-21
Author(s):  
Guocheng Zhao ◽  
Haining Lu ◽  
Longfei Xiao ◽  
Jingchao Hu
Keyword(s):  
Flow Field ◽  
Time History ◽  
Basic Research ◽  
Shape Effect ◽  
Detached Eddy Simulation ◽  
Field Methods ◽  
Dye Tracing ◽  
Suction Force ◽  
Polymetallic Nodule ◽  
Suction Flow

Abstract Turbulent suction pipe flow around a near-wall ellipsoid nodule, as basic research of polymetallic nodule hydraulic collection, is investigated numerically and experimentally in this paper. Seven ellipsoids with axe ratios (a/b) ranging from 1 to 2 are considered as nodule models to reveal the shape effect on the characteristics of suction forces and suction flow field. Methods of particle image velocimetry (PIV) and dye tracing were used to visualize the suction flow field. The results indicate that: (1) suction force coefficients increase with a/b; (2) the shape effect is more significant in the cases with smaller ratios of bottom clearance to semi-thickness of the ellipsoid (h/c); (3) the weak vortex shedding in suction flow results in small-amplitude fluctuations of time-history suction forces; (4) the detached-eddy simulation (DES) method based on shear stress transport (SST) model is validated to be accurate and feasible for predicting the suction forces and suction flow field. It is expected to provide references for the design of nodule pick-up devices and to help us further understand the mechanism of hydraulic collection.

scholarly journals FACTORS INFLUENCING KARST AQUIFER RECHARGE AS EVIDENCED THROUGH VADOSE DYE TRACING

2018 ◽  
Author(s):  
Amaël Poulain ◽  
◽  
Arnaud Watlet ◽  
Gaëtan Rochez ◽  
Olivier Kaufmann ◽  
...  
Keyword(s):  
Karst Aquifer ◽  
Aquifer Recharge ◽  
Dye Tracing ◽  
Factors Influencing
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