TY - JOUR
T1 - Using impellers to distribute local nutrient loadings in a stratified lake : Lake Como, Italy
AU - Morillo, S.
AU - Imberger, Jorg
AU - Antenucci, Jason
AU - Copetti, D.
PY - 2009
Y1 - 2009
N2 - The feasibility of using a vertically downward pointing impeller to remove polluted water from a coastal margin was investigated with a pilot experiment in Lake Como, Italy. The vertical jet induced by the impeller entrained surface water downward to depth, where upon reaching neutral buoyancy it intruded horizontally into the lake proper. A three-dimensional numerical hydrodynamic model was validated with results from an intensive (eight-day) field study during which rhodamine WT dye was introduced in the lee of the impeller and then tracked as it was transported into the lake. One of the major sources of pollution to the lake is the Cosia River underflow that drains a catchment adjacent to the City of Como. The numerical model, once validated, was used to show that six impellers, with the correct thrust, could be used to reduce the pollutants adjacent to the City of Como by half within two weeks; this was achieved by injecting the surface water to a depth that would intensify the Cosia River intrusion.
AB - The feasibility of using a vertically downward pointing impeller to remove polluted water from a coastal margin was investigated with a pilot experiment in Lake Como, Italy. The vertical jet induced by the impeller entrained surface water downward to depth, where upon reaching neutral buoyancy it intruded horizontally into the lake proper. A three-dimensional numerical hydrodynamic model was validated with results from an intensive (eight-day) field study during which rhodamine WT dye was introduced in the lee of the impeller and then tracked as it was transported into the lake. One of the major sources of pollution to the lake is the Cosia River underflow that drains a catchment adjacent to the City of Como. The numerical model, once validated, was used to show that six impellers, with the correct thrust, could be used to reduce the pollutants adjacent to the City of Como by half within two weeks; this was achieved by injecting the surface water to a depth that would intensify the Cosia River intrusion.
U2 - 10.1061/(ASCE)HY.1943-7900.0000048
DO - 10.1061/(ASCE)HY.1943-7900.0000048
M3 - Article
SN - 0733-9429
VL - 135
SP - 564
EP - 574
JO - Journal of Hydraulic Engineering
JF - Journal of Hydraulic Engineering
IS - 7
ER -