RIASSUNTO
ABSTRACT
This study aimed to research the morphological changes around the coastline adjacent to the Hsinchu Fishery Port, one of the 13 hot spots of massive morphological changes in Taiwan announced by the Ministry of the Interior, Taiwan. The trend of coastal change could be understood via the sediment transport analysis from field topographic surveys; however, the range of the affected area in question was unclear because of the lack of the topographic survey data. To compensate the drawback, we employed a numerical model such as MIKE 21, which can simulate the circumstances concerning whether there is a coastal structure or an estuarine sediment. All the possible scenarios thereof have been compared and discussed. The range of the area under impact was identified extending for 4.8km from the north of the Hsinchu Fishery Port and for 7.3 km from the south of the port, 12.1 km in total.
INTRODUCTION
The nearshore coastal development—including the construction of commercial ports, seawalls, revetments, groins, and offshore/submerged breakwaters—is one of the most important anthropogenic effect on nearshore morphology. It may change the original hydrodynamic mechanism, causing abnormal sediment transport and irreversible morphology change (Martins and Pereira, 2014). However, even in developing countries, coastal structures were usually built in nearshore without a robust consideration of the effect of coastal developments and without a satisfactory plan on coastal management, leaving the society and its economics unprotected (Migue et al., 2014). Human coastal activities can intensify the effects of coastal erosion and accumulation, natural processes on nearshore morphology because the erosive circumstances usually occurred in densely populated areas (Lopez and Marcomini, 2013; Horikawa, 1988). It is thus an important issue for coastal management how coastal developments will influence coastal morphology. Regarding the relationship between coastal developments and their impact on coastal morphology, both investigating analysis and numerical modeling are good approaches.