REVISION OF JAPAN'S MATERIAL STOCK DATABASE AND REASSESMENT OF THE STOCK EFFICIENCY TRENDS

Abstract

 Japan has large numbers of seaports, fishing harbors, and coastal facilities. Therefore, quantifying the kinds of material stock in there infrastructures is important. This study showed that seaports, fishing harbors, and coastal facilities have accumulated 783Mton, 1714Mton, 472Mton of material stock, respectively. In this way, this study expands the database of Japan's material stock to include seaports, fishing harbors, and coastal facilities, and provides a reassessment of these stock efficiency trends compared with other stock types. These results help to evaluate society's metabolism (inflows, stocking, and demolition of material).
 Reassessment of stock efficiency trends regarding units of transportation showed that airports' efficiency trends grew. Roads' and rails' trends regarding freight increased, while seaports' stock trends in regards to number of passengers declined.