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<p><strong>Abstract.</strong> This paper is focused on finding rules for waveheight change in a solitary wave as it runs up a slowly increasing bottom. A coupled BBM system is used to describe the solitary waves. Expressions for energy density and energy flux associated with the BBM system are derived, and the principle of energy conservation is used to develop an equation relating the waveheight and undisturbed depth to the initial undisturbed depth and the incident waveheight. In the limit ofdoi:10.5194/npg-20-213-2013 fatcat:oqv33ojojzeibhdjvu7shk64bm