The sand dredging activities on the reef flat to meet the material requirement of engineering construction are prevalent around some Asia-Pacific reef islands, and its potential impact on the coastal hazard mitigation raises growing attention in the community of coastal research. In contrast to the extensively studied spectral wave processes with reef-flat excavation pit over fringing reefs, limited investigations have focused on the wave transformation possesses over such an artificially modified reef profile under monochromatic waves. To remedy current research deficiency, a new set of physi...