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An integral expression is developed for the mountain wave drag (MWD) associated with linearized, hydrostatic flow over two infinitely long, bell‐shaped ridges. This analysis extends previous studies of airflow over a single ridge. The MWD is expressed in canonical form with three terms: the sole effect of each ridge and a cross‐term. While all three terms tend to zero with the appropriate inverse Rossby number, the cross‐term also tends to zero with large ridge‐ridge separation normalized by the sum of the half‐widths. Asymptotic expansions of the dimensionless integral forms arising from the three terms in the MWD expression are presented.
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Grisogono et al. (1993) studied this question.
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