LARSEN Magnu ルンド大学, 工学部, 助教授
BASCO David オールドドミニオン大学, 工学部, 教授
TSUCHIYA Yoshito Meijo Univ., Faculty of Urban Science, Prof., 都市情報学部, 教授 (90025883)
LARCEN Magun ルンド大学, 工学部, 助教授
LARSEN Magnus Lund Univ., Dept.Civil & Eng., Assoc.Prof.
BASCO David R. Old Dominion Univ., Dept.Civil & Env.Eng., Prof.
|Budget Amount *help
¥3,300,000 (Direct Cost : ¥3,300,000)
Fiscal Year 1998 : ¥1,500,000 (Direct Cost : ¥1,500,000)
Fiscal Year 1997 : ¥1,800,000 (Direct Cost : ¥1,800,000)
Scientific understanding of how natural beaches mitigate storm energy has now become the basis for the consideration of beaches as soft shore protection structures by the coastal engineering profession. Focusing on the beach nourishment projects, own shore protection strategies in JAPAN, USA and EU has been evaluated by mutual survey. The main results obtained are :
EU case : The beach fill situation in the countries of the European Union is highlighted and discussed with respect to the general situation, project type and objectives, design and evaluation procedures, legal framework, and financial aspects. As expected, significant differences were found between the investigated countries. In general, the study shows that it would be very profitable for south European countries to learn about the Dutch and German practices, particularly regarding the long-term coastal management and the regular monitoring of the coastal morphology. On the other hand, recent Dutch experience has shown tha
t their legal system is a bit too rigid leading to automatic local renourishments that are unnecessary to reach the global objective
USA case : A 1971 study by the US Army Corps of Engineers found 2600 miles (4200 km) to be experiencing critical erosion. Between 1 950 and 1 995 the Corps constructed 56 large shore protection projects that covered 210 miles (340 kin) or about 8 percent of that eroding. In 1970, a shift from hard structures (20%) to soft structures (80%) as beach nourishment occurred that continues today. Actual construction costs to 1993 totaled $670 million or about $15 million per year. In 1995 dollars ; adjusted costs were $1,580 million or $34 million per year. The total volume of sand placed was about 1 90 million cubic yards (cy) for the 49 projects that involved beach nourishment. Average unit sand cost was $3.55 per cy.
d) これにより,各工法の特色,地域性および問題点を明確にした。 Less