Perfect transmission and asymptotic solutions for reflection of ice-coupled waves by inhomogeneities

摘要: Dissimilar imperfections such as cracks and pressure ridges in sea ice result similar reflection coefficients when they scatter ice-coupled waves, being highly reflective at short wavelengths, transmissive long having some periods which transmission is perfect (although associated with a change phase). The causes of the zeroes coefficient are not well understood where analytic solutions can be found physical interpretations difficult. Here we examine simplified systems that amenable to an interpretation. For single crack sheet present asymptotic solution for very thin furnish new interpretation existing wide-spacing approximation suggests zero caused by destructive interference waves reflected from each two sides crack. simple rectangular ridge report small feature also shows arises but, this case, mass rigidity ridge.