Observations off the New Jersey coast document the shoaling of three groups of nonlinear internal waves of depression over 35 km across the shelf. Each wave group experienced changing background conditions along its shoreward transit. Despite different wave environments, a clear pattern emerges. Nearly symmetric waves propagating into shallow water develop an asymmetric shape; in the wave reference frame, the leading edge accelerates causing the front face to broaden while the trailing face remains steep. This trend continues until the front edge and face of the leading depression wave become unidentifiable and a near-bottom elevation wave emerges, formed from the trailing face of the initial depression wave and the leading face of the following wave. The transition from depression to elevation waves is diagnosed by the integrated wave vorticity, which changes sign as the wave's polarity changes sign. This transition is predicted by the sign change of the coefficient of the nonlinear term in the KdV equation, when evaluated using observed profiles of stratification and velocity.
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Univ Western Australia, Oceans Grad Sch, Perth, WA, Australia
Univ Western Australia, Oceans Inst, Perth, WA, AustraliaUniv Western Australia, Oceans Grad Sch, Perth, WA, Australia
Zulberti, A.
Jones, N. L.
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Univ Western Australia, Oceans Grad Sch, Perth, WA, Australia
Univ Western Australia, Oceans Inst, Perth, WA, AustraliaUniv Western Australia, Oceans Grad Sch, Perth, WA, Australia
Jones, N. L.
Ivey, G. N.
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Univ Western Australia, Oceans Grad Sch, Perth, WA, Australia
Univ Western Australia, Oceans Inst, Perth, WA, AustraliaUniv Western Australia, Oceans Grad Sch, Perth, WA, Australia
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Univ of California, Scripps Inst of, Oceanography, La Jolla, CA, USA, Univ of California, Scripps Inst of Oceanography, La Jolla, CA, USAUniv of California, Scripps Inst of, Oceanography, La Jolla, CA, USA, Univ of California, Scripps Inst of Oceanography, La Jolla, CA, USA
Elgar, Steve
Guza, R.T.
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Univ of California, Scripps Inst of, Oceanography, La Jolla, CA, USA, Univ of California, Scripps Inst of Oceanography, La Jolla, CA, USAUniv of California, Scripps Inst of, Oceanography, La Jolla, CA, USA, Univ of California, Scripps Inst of Oceanography, La Jolla, CA, USA