Taiwan is surrounded by the ocean. Her coastal plains are the centers of urbanization and economic developments, where various activities have taken place frequently in the regions abundant in natural resources. Having been benefited by the martial law reinforced until 1988, the natural ecology, landscapes and historical relics in many coastal areas were preserved without large scale development. After the abolition of the martial law, many sensitive and vulnerable coastal areas have been affected by over exploitation or improper shore protection schemes undertaken by public and private sectors without due consideration of their consequence, thus resulting in large scale nearshore reclamations for industrial zones and seawalls incorporating precast armor units to replace the coastal strips that were once beautiful sandy beaches. The engineering works associated with these developments not only have spoiled the natural coastal landscapes but also have caused severe beach erosion, in addition to the adverse impact on sensitive and fragile ecological systems. Located in the west of Kaohsiung city, Sizihwan is not only the facade of the gateway of Kaohsiung international harbor, but also a major attraction for the people living in Kaohsiung to gain intimacy with the sea. The sandy sea shore at Sizihwan, bounded between the rocky hills and the northern breakwater to the Kaohsiung First Harbor, is the precious property of Kaohsiung City. The length of the sandy beach of Sizihwan, about one kilometer originally, was halved resulting from the reestablishment of the National Sun Yat-sen University soon after 1980 for land reclamation to make space for her College of Marine Sciences. Due to increasing number of visitors in recent time under the policy of tourism promotion, it has become vital to recover Sizihwan beach to its past glory. For this reason, the Kaohsiung City Government has determined to undertake this project with a comprehensive investigation, in the hope of making Sizihwan a model of scenic and ecological restoration in Taiwan. This thesis reports in details the process of how the Kaohsiung City Government in carrying out the Sizihwan restoration project since 2005, It consists the complete events from planning, tendering, extra funding to engineering implementation, to serve as the first technical literature in Taiwan for the construction of an artificial headland-bay beach with nourishment. With the support from people in various government authorities, engineering consultants, construction industries and coastal experts in Taiwan, the promotion of beach recovery at Sizihwan has gained sufficient momentum since 2005, aiming to install two artificial headlands incorporating beach nourishment for the provision of a stable sandy bay beach. The author of this report has had the honor in participating in this unique beach restoration project at Sizihwan, as part of his administration duty while serving himself in the Kaohsiung City Government.

Artificial beach nourishment, the most common method to mitigate coastal erosion in the United States, is also considered the most ecologically friendly alternative for shoreline stabilization. However, this habitat alteration has the potential to impact nesting marine turtles and developing hatchlings. The first objective of this study was to determine how nourishing beaches with two different design templates affects loggerhead (Caretta caretta) and green turtle (Chelonia mydas) nesting success, the ratio of nests to the total number of nests and non-nesting emergences, and reproductive success, the ratio of hatched and emerged hatchlings to the total number of eggs deposited. Two types of restoration designs exist along the southern Brevard County, FL coastline, which supports some of the highest density loggerhead and green turtle nesting worldwide. Since 2005, approximately 35 kilometers of beach have undergone 1) fullscale restoration (typically called nourishment), where sand was added above and below the mean high tide line (2005, 2010) or 2) dune restoration, where sand was placed on the dune (2005, 2006, 2008, 2009). To quantify the effects of these restoration types, we used a Before-After-ControlImpact-Paired Series (BACIPS) model, which tests for significance between the difference in nesting success rates at the impact (engineered) and control sites (natural beach) before and after restoration ( ). For loggerheads, there was a significant difference in after dune restoration during the years of construction (2005, 2006, 2008, and 2009; p