Yasuhiro SHUIN, Norifumi HOTTA, Yosuke YAMAKAWA, Masakazu SUZUKI<\/p>\n
In this paper, we propose a new single index for estimating the magnitude of heavy rainfall events that have a high probability of causing sediment\u2010related disasters\uff08SRD\uff09and examine the efficacy of an early warning system\uff08EWS\uff09based on this index. The single index is derived from a snake line connecting plots of heavy rainfall events on an x\u2010y plane, with the common logarithm of return period at a given soil water index\uff08SWI\uff09on the x\u2010axis and hourly rainfall\uff08HR\uff09on the y\u2010axis. The index\uff08IRPI\uff09is defined as the distance from the coordinate origin to x\u2010y points on the snake line. The IRPI is integrated with SWI, representing the long\u2010term rainfall effect, and HR, indicating the short\u2010term rainfall effect on SRD using the same units\uff08i.e., years\uff09as return period. EWS using IRPI were applied to the western region of Izu\u2010Oshima Island, Tokyo, Japan, where typhoons Wipha\uff08\uff12\uff10\uff11\uff13\uff09and Ida\uff08\uff11\uff19\uff15\uff18\uff09caused severe SRDs. The results of this study were as follows\uff1a\uff11\uff09The difference between heavy rainfall causing SRD and heavy rainfall that does not occur is to be recognized as a difference of IRPI\uff1b\uff12\uff09IRPI can be displayed along a time axis based on the single index, making estimation of the temporal fluctuation of SRD risk during each heavy rainfall event simpler than estimation using an x\u2010y plane without a time axis; and\uff13\uff09Employing IRPI in an early warning system allows intuitive understanding of the meaning of the critical value, since IRPI uses the same units as return period.<\/p>\n
early warning system, return period, sediment\u2010related disaster, single rainfall index<\/p>\n","protected":false},"excerpt":{"rendered":"
Evaluation of sediment\u2010related disasters risk with a single rainfall index based on a return period:\u00a0Case study of Izu\u2010Oshima, Tokyo, Japan Yasuhiro SHUIN, Norifumi HOTTA, Yosuke YAMAKAWA, Masakazu SUZUKI Abstract In this paper, we propose a new single index for estimating the magnitude of heavy rainfall events that have a high probability of causing sediment\u2010related disasters\uff08SRD\uff09and examine the efficacy of an early warning system\uff08EWS\uff09based on this index. The single index is derived from a snake line connecting plots of heavy rainfall events on an x\u2010y plane, with the common logarithm of return period at a given soil water index\uff08SWI\uff09on the x\u2010axis and hourly rainfall\uff08HR\uff09on the y\u2010axis. The index\uff08IRPI\uff09is defined as the […]<\/p>\n","protected":false},"author":3,"featured_media":0,"parent":1250,"menu_order":56,"comment_status":"closed","ping_status":"closed","template":"page-single-column.php","meta":{"footnotes":"","_wp_rev_ctl_limit":""},"class_list":["post-1287","page","type-page","status-publish","hentry","wpautop"],"_links":{"self":[{"href":"https:\/\/jsece.or.jp\/en\/wp-json\/wp\/v2\/pages\/1287","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/jsece.or.jp\/en\/wp-json\/wp\/v2\/pages"}],"about":[{"href":"https:\/\/jsece.or.jp\/en\/wp-json\/wp\/v2\/types\/page"}],"author":[{"embeddable":true,"href":"https:\/\/jsece.or.jp\/en\/wp-json\/wp\/v2\/users\/3"}],"replies":[{"embeddable":true,"href":"https:\/\/jsece.or.jp\/en\/wp-json\/wp\/v2\/comments?post=1287"}],"version-history":[{"count":0,"href":"https:\/\/jsece.or.jp\/en\/wp-json\/wp\/v2\/pages\/1287\/revisions"}],"up":[{"embeddable":true,"href":"https:\/\/jsece.or.jp\/en\/wp-json\/wp\/v2\/pages\/1250"}],"wp:attachment":[{"href":"https:\/\/jsece.or.jp\/en\/wp-json\/wp\/v2\/media?parent=1287"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}