{"id":93,"date":"2020-01-31T11:06:22","date_gmt":"2020-01-31T02:06:22","guid":{"rendered":"http:\/\/isgs.kyushu-u.ac.jp\/~kan\/?page_id=93"},"modified":"2020-08-31T16:33:23","modified_gmt":"2020-08-31T07:33:23","slug":"research-en","status":"publish","type":"page","link":"https:\/\/isgs.kyushu-u.ac.jp\/~kan\/research-en\/","title":{"rendered":"Research"},"content":{"rendered":"<h3>High-resolution multi-beam bathymetric survey for coastal seafloor geomorphology<\/h3>\n<div class=\"paragragh\">\n<p>Scientific knowledge of the coastal seafloor is limited. Therefore, we are pursuing geomorphology and related interdisciplinary sciences on the coastal zones by observing high-resolution seafloor bathymetric maps using a multibeam echosounder R2 Sonic 2022 that I introduced to our laboratory. We have made many discoveries in the coral reef areas in the Ryukyu Islands, and we expect to find more in our ongoing research.<\/p>\n<\/div>\n<div class=\"figure\">\n<figure>\n<span class=\"bottomright\">&copy; HIRONOBU KAN<\/span><br \/>\n<img decoding=\"async\" src=\"https:\/\/isgs.kyushu-u.ac.jp\/~kan\/wp-content\/uploads\/2020\/02\/03.jpg\" alt=\"\" width=\"520\" style=\"pointer-events: none;\"><br \/>\n<\/figure><figcaption>Submerged karst landform we discovered in Nagura Bay, Ishigaki Island, southern Ryukyus.\u3000<\/figcaption><\/div>\n<ul class=\"link\">\n<li><a href=\"http:\/\/www.sciencedirect.com\/science\/article\/pii\/S0169555X14003973\">Open Access Paper in Geomorphology (Elsevier)<\/a><\/li>\n<li><a href=\"http:\/\/www.gebco.net\/about_us\/gebco_science_day\/documents\/kan_etal_agu14_poster.pdf\n\">Poster presented at AGU 2014 (JEBCO Science Day document)<\/a><\/li>\n<\/ul>\n<div class=\"crr\"><\/div>\n<h3>Geomorphology and development of coral reefs<\/h3>\n<div class=\"paragragh\">\n<p>Coral reefs are dynamic geomorphological systems formed by corals and other reef building organisms. These organisms deposit solid limestone and build up wave-resistant structure. We are studying the geomorphology and development of coral reefs using cores obtained from submersible hydraulic drills or through observation and sampling from harbor excavation in reefs.<\/p>\n<\/div>\n<div class=\"figure\">\n<figure class=\"width_036\">\n<span class=\"topleft color_W\">&copy; HIRONOBU KAN<\/span><br \/>\n<img decoding=\"async\" src=\"https:\/\/isgs.kyushu-u.ac.jp\/~kan\/wp-content\/uploads\/2020\/02\/04.jpg\" alt=\"\" style=\"pointer-events: none;\"><figcaption>Reef coring using submersible hydraulic drill.<\/figcaption><\/figure>\n<figure class=\"width_060\">\n<img decoding=\"async\" src=\"https:\/\/isgs.kyushu-u.ac.jp\/~kan\/wp-content\/uploads\/2020\/02\/05.png\" alt=\"\" style=\"pointer-events: none;\"><figcaption>Development of  a modern fringing reef in the Ryukyu Islands (from \u201cRyukyus\u201d written by H. Kan in Encyclopedia of Modern Coral Reefs\u201d, Springer, 2011).<\/figcaption><\/figure>\n<\/div>\n<div class=\"crr\"><\/div>\n<h3>Observation and analysis using SEM-EDS and XRD<\/h3>\n<div class=\"paragragh\">\n<p>We are examining rock and sediment samples using scanning electron microscope energy-dispersive X-ray spectrometer (JEOL JSM-6390L variable pressure SEM with a JEOL JED-2300 EDS). X-ray diffraction analyses are conducted with a Rigaku Miniflex II X-ray diffractometer to determine the mineralogy of the samples.<\/p>\n<\/div>\n<div class=\"figure\">\n<figure class=\"width_048\">\n<img decoding=\"async\" src=\"https:\/\/isgs.kyushu-u.ac.jp\/~kan\/wp-content\/uploads\/2020\/02\/06.jpg\" alt=\"\" style=\"pointer-events: none;\"><figcaption>SEM-EDS (JEOL JSM-6390LA)<\/figcaption><\/figure>\n<figure class=\"width_048\">\n<img decoding=\"async\" src=\"https:\/\/isgs.kyushu-u.ac.jp\/~kan\/wp-content\/uploads\/2020\/02\/07.jpg\" alt=\"\" style=\"pointer-events: none;\"><figcaption>X-ray diffractometer (Rigaku Miniflex &#8545;)<\/figcaption><\/figure>\n<\/div>\n<div class=\"crr\"><\/div>\n<h3>Reef development, geomorphology and hazards in the Pacific and Indian Ocean atolls<\/h3>\n<div class=\"paragragh\">\n<p>Atoll nations are established on cays on coral atolls in the Pacific and Indian Ocean. We conducted field surveys in atoll nations for reef and island geomorphology, reef growth and disasters in the Republic of Marshall Islands, Kiribati, Tuvalu and Maldives.<\/p>\n<p>All atoll nations\/districts in the Pacific and Indian Oceans face a potential risk of severe tsunami-induced damage. After the 2004 Indian Ocean Tsunami, we investigated 43 islands in the northern-to-southern Maldives by measuring watermarks and profiles across the islands, and interviewing local residents to determine the characteristics of the tsunami and evacuation procedures. <br \/>I hope that the information on the December 2004 tsunami events and disaster measures in Maldives will contribute to a better understanding of the risks faced by atoll nations, as well as to developing risk management strategies. <\/p>\n<ul class=\"link\">\n<li><a href=\"http:\/\/www.sil.si.edu\/digitalcollections\/atollresearchbulletin\/ARB_RecordSingle.cfm?issue=554\">Open Access Paper in Atoll Research Bulletin (Smithsonian Institution)<\/a><\/li>\n<\/ul>\n<\/div>\n<div class=\"figure\">\n<figure class=\"width_045\">\n<span class=\"topleft color_W\">&copy; HIRONOBU KAN<\/span><br \/>\n<img decoding=\"async\" src=\"https:\/\/isgs.kyushu-u.ac.jp\/~kan\/wp-content\/uploads\/2020\/02\/09.jpg\" alt=\"\" style=\"pointer-events: none;\"><figcaption>An toll island occupied by a residential buildings in Majuro Atoll, the Republic of Marshall Island (September 1999).<\/figcaption><\/figure>\n<figure class=\"width_045\">\n<span class=\"bottomright color_W\">&copy; HIRONOBU KAN<\/span><br \/>\n<img decoding=\"async\" src=\"https:\/\/isgs.kyushu-u.ac.jp\/~kan\/wp-content\/uploads\/2020\/02\/08.png\" alt=\"\" style=\"pointer-events: none;\"><br \/>\n<\/figure><figcaption>Untouched debris remains on Madifushi Island after the 2004 Indian Ocean Tsunami in the southern Maldives (August 2005). <\/figcaption><\/div>\n","protected":false},"excerpt":{"rendered":"<p>High-resolution multi-beam bathymetric survey for coastal seafloor geomorphology Scientific knowledge of the c [&hellip;]<\/p>\n","protected":false},"author":4,"featured_media":0,"parent":0,"menu_order":0,"comment_status":"closed","ping_status":"closed","template":"page-en.php","meta":{"footnotes":""},"class_list":["post-93","page","type-page","status-publish","hentry"],"aioseo_notices":[],"_links":{"self":[{"href":"https:\/\/isgs.kyushu-u.ac.jp\/~kan\/wp-json\/wp\/v2\/pages\/93","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/isgs.kyushu-u.ac.jp\/~kan\/wp-json\/wp\/v2\/pages"}],"about":[{"href":"https:\/\/isgs.kyushu-u.ac.jp\/~kan\/wp-json\/wp\/v2\/types\/page"}],"author":[{"embeddable":true,"href":"https:\/\/isgs.kyushu-u.ac.jp\/~kan\/wp-json\/wp\/v2\/users\/4"}],"replies":[{"embeddable":true,"href":"https:\/\/isgs.kyushu-u.ac.jp\/~kan\/wp-json\/wp\/v2\/comments?post=93"}],"version-history":[{"count":4,"href":"https:\/\/isgs.kyushu-u.ac.jp\/~kan\/wp-json\/wp\/v2\/pages\/93\/revisions"}],"predecessor-version":[{"id":246,"href":"https:\/\/isgs.kyushu-u.ac.jp\/~kan\/wp-json\/wp\/v2\/pages\/93\/revisions\/246"}],"wp:attachment":[{"href":"https:\/\/isgs.kyushu-u.ac.jp\/~kan\/wp-json\/wp\/v2\/media?parent=93"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}