Title: Investigation of shoreline change trends around the Nanakita River mouth using aerial photograph
Abstract: ABSTRACT The shoreline is dynamic feature in the coastal area. It always changes in respond to natural forces. As a border between land and sea, the stable shoreline is more preferable due to a lot utilization of coastal area. This study attempts to analyze the shoreline change trends around the Nanakita River mouth by utilizing the aerial photograph which has been taken regularly in that area. The results show that the shoreline around the Nanakita River mouth is moving dynamically during the time with maximum-minimum range is about 70 m and standard deviation is about ± 14 m. The shoreline change trends was retreat from 1990~1999, change to advance in 2000~2005 and back to retreat again in 2006~2009. The left side has bigger changes than the right side due to the effect of port breakwater. Additionally, the shoreline around the Nanakita River mouth is considered in condition “dynamic stable”. 1. INTRODUCTION The shoreline is the border between land and sea. The shoreline is influenced by natural process such as wave, tide and current which exist in sea area. The shoreline responds those processes by moving advance to the sea or retreat to the land. However, the stable shoreline is more preferable due to a lot utilization of coastal area as human living, various kind facility, and environmental preservation. Therefore, the study of shoreline change is important for managing the utilization of coastal area. This study attempt to investigate the shoreline condition around river mouth specially at the Nanakita River Mouth. The Nanakita River is located at Sendai City in Miyagi Prefecture Japan. The length of river is 45 km and the basin area is 229.1 km2. Flood discharge of 100-years return period is 1,650 m3/s and typical river discharge is 10 m3/s. The Nanakita river mouth is located at east side of Japan Coast, facing to the Pacific Ocean. Tidal range at Sendai Coast is about 1.5 m at spring tides and most prevailing incoming wave is from south-east direction. These wave conditions generate longshore current and sediment transport from south to north direction for overall coast. The location of study can be seen in Figure 1. Teizan
Publication Year: 2010
Publication Date: 2010-03-01
Language: en
Type: article
Access and Citation
Cited By Count: 1
AI Researcher Chatbot
Get quick answers to your questions about the article from our AI researcher chatbot