The arrangement of the elliptical cylinders depicted in Fig. 1 is investigated. All bodies are considered fixed
on the bottom and exposed to the action of monochromatic incident waves of frequency ω and linear amplitude
H/2, propagating at angle α to the positive x direction. The bodies are fixed in water of depth h. The large and the
small radii of the kth body are denoted by ak and bk respectively. Elliptical cylindrical coordinates (u,v,z) are
employed, u=constant, v=constant being orthogonaly intersecting families of confocal ellipses and hyperbolae,
respectively. The z-axis is fixed on the bottom, pointing vertically upwards. It is assumed that the reader is
familiar with Mathieu functions and their definitions and properties [1-5]. The velocity potentials must satisfy
the Laplace equation and the conditions on the bottom and the free surface. The total velocity potential must also
satisfy the kinematical condition on the wetted area of the bodies