Sediment Transport around Headlands in the Southern Sendai Coast

Abstract

The Southern Sendai Coast is facing the Pacific Ocean in the northern part of Japan, where is a typical coastal erosion area in this country. To prevent the erosion and to control the longshore sediment transport, eight headlands have been constructed at intervals of 1km since 1997 to present. The purpose of this study is to understand beach topographic features in the vicinity of the headlands from field data, and to simulate this features using FUNWAVE based on the fully nonlinear Boussinesq model of Wei et al.(1995). The field data showed a long and slender depositional area in the point of the headlands on the offshore side and the numerical simulation could explain the depositional area qualitatively from both the results under ordinary and stormy conditions. 1.•@‚Í ‚ ¶ ‚ß ‚É ‹ß "N,‰ˆŠÝ‰ˆŠÝ ‚É ‚¨‚¯‚¨‚¯ ‚é•\ '¢ •¨ ‚ÌOEš •Ý ‚â ‰Í •ì ‚© ‚ç‚Ì "y •» ‹Ÿ ‹‹ ‚ÌOE¸•‚ÌOE¸•-‚È ‚Ç ‚É ‚ae ‚Á‚Ä ‰ˆŠÝ‰ˆŠÝ •Y •» ‚Ì"y •» Žû Žx ƒo ƒ‰ ƒ"ƒX ‚ª •ö ‚ê ‚é ‚± ‚AE ‚É ‚ae ‚è,"ú-{ Še 'n ‚Å ŠC ŠÝ •N •H ‚ª-â 'è ‚AE‚È ‚Á‚Ä ‚¢ ‚é.‚± ‚Ì 'Î •ô ‚AE ‚µ‚Ä "Ë 'ç ‚â-£ ŠÝ 'ñ ‚È ‚Ç-l •X ‚È•\ '¢ •¨ ‚ª OEš •Ý ‚³ ‚ê ‚Ä ‚« ‚½‚ª,‹G •ß ‚É ‚ae ‚Á‚Ä "g OEü ‚ª •Ï ‰» ‚· ‚é ‚ae ‚¤ ‚ÈŠC ŠÝ ‚É'Î ‚µ‚Ä ‚Í ƒw ƒb ƒhƒ‰ ƒ" ƒh•H-@ ‚É ‚ae ‚è,ŠC ŠÝ •ü ‚ð ‚¢ ‚-‚ ‚© ‚É•ª Š" ‚µ‚Ä ƒ| ƒP ƒb ƒg ƒr•[ ƒ`‰» ‚ð •} ‚éŽè-@ ‚ª ‚AE ‚ç‚ê ‚Ä ‚¢ ‚é(‰F '½ ‚ç,1994).ƒw ƒb ƒh ƒ‰ ƒ" ƒh‚Ì '· ‚³ ‚É ‚ae ‚鉈ŠÝ‚鉈ŠÝ •Y •» ‚Ì•ß '¨-¦ ‚̈á‚Ìˆá ‚¢ ‚â(•² "¡ ‚ç,1998),ƒw ƒb ƒhƒ‰ ƒ" ƒh‚Ì OEø ‰Ê "I ‚ÈOE`‚ÈOE`•ó(‰F '½ ‚ç,2007)‚É ŠÖ ‚· ‚éOE¤ ‹ † ‚Í ‚È ‚³ ‚ê ‚Ä ‚¢ ‚é ‚à ‚Ì ‚Ì,OEš •Ý ' † ‚Ì ƒw ƒb ƒhƒ‰ ƒ" ƒhOEQ ‚ð ŠÜ ‚Þ •L-Ì ˆae ‚É ‚¨‚¯‚¨‚¯ ‚é"y •»-A '-‚ÉŠÖ ‚· ‚é'm OE© ‚Í"¾ ‚ç‚ê ‚Ä ‚È ‚¢.-{ OE¤ ‹ † ‚Å ‚Í,OE» •Ý ‚à ƒw ƒb ƒhƒ‰ ƒ" ƒhOEš •Ý ‚ª•i ‚ß ‚ç‚ê ‚Ä ‚¢ ‚é•å 'ä ˜p "ì •" ‚Ì ŽR OE³ ŠC ŠÝ ‚É ‚¨‚¢‚¨‚¢ ‚Ä OE» 'n '² •¸ OE‹ ‰Ê ‚ae ‚è'n OE` •Ï ‰» "Á •« ‚ð '² ‚× ‚é ‚AE ‚AE ‚à ‚É,Šg '£ OE^ ‚Ì ‹-"ñ •ü OE` Boussinesqƒ‚ ƒf ƒ‹(FUNWAVE;Wei‚ç,1995)‚ð-p ‚¢ ‚½ •" 'l OEv ŽZ ‚É ‚ae ‚è ‚±‚Ì "Á •« ‚Ì ƒ• ƒJ ƒj ƒY ƒ€ ‚ð-¾ ‚ç‚© ‚É‚· ‚é ‚± ‚AE‚ð-Ú"I ‚AE ‚· ‚é.