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Estimation and Verification on the Gross Tonnage of Najuson ship in the Koryo Dynasty
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고려 초기 나주선의 톤수추정과 검증

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Type
Academic journal
Author
S. June Kim (한국해양대학교) Kyeong ok Kim (한국해양과학기술원)
Journal
호남사학회 역사학연구 역사학연구 제79호 KCI Accredited Journals
Published
2020.1
Pages
33 - 60 (28page)

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Estimation and Verification on the Gross Tonnage of Najuson ship in the Koryo Dynasty
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Najuson ship, which contains 9.2 meters bottom plate and 5.6 meters L-typed bottom stringers and was discovered at the basin of Yeongsan River in 2004, is presumed the biggest Korean ship of the excavated Korean ships. According to the previous researches, Najuson ship was estimated to be a super-larger Korean ship with a total length of 32 ~ 42 meters, or Choma ship which was grain-tax carrying vessel in the Koryo dynasty. Koryo ships can be classified into four types : King Taejo’s Nuson(big flag ship), Kwason(spike and ram ship), Chomason ship, and Japan Expedition ship. Kwason was a naval ship for defending against the Jurchen pirates along the sea coasts of the Northeast area during the 11th century, and Japan Expedition ships were used for invasion of Kyushu, Japan by Yuan-Koryo allied navies at the end of 13th century. Therefore, it might be relatively low that the probability of Najuson ship, discovered at the Yeongsan River basin, is either Kwason or Japan Expedition ship. Also, as in the previous study, assuming that the Najuson ship is a Chomason ship, the possibility that it was a King Taejo’s Nuson might be basically excluded. In this paper, the authors are trying to estimate the size of Najuson ship by extracting and applying the composition ratios of the main ship’s particulars from the excavated Koryo ships with L-typed stringer and from other Korean traditional ships. Section 2 reviews the excavated Koryo ships with L-type stringers such as Sibidongpado ship, Wando ship, and No 2 Daebudo ship. In section 3, after assuming length of keel of Najuson ship through the remaining bottom plate and L-typed bottom stringer parts, the authors calculate and verify the tonnage of Najuson ship by estimating the length and width of main deck, and depth. As a result of estimation and verification, it is estimated that Najuson ship was about 218 gross tonnage. Since this tonnage is a abbreviated figure calculated by applying the calculation of the ship’s tonnage under 24 meters, it results in approximately 230 gross tons by adding about 5 % to convert it to the ship’s tonnage over 24 meters. In this case, the length of bottom plate of Najuson ship is 22 meters, the width of bottom plate 6.81 meters, the length of main deck 31.46 meters, the width of main deck 12.34 meters and the depth 4.97 meters. This study is limited in that it is only an estimate using a small amount of residual ship’s parts. However, it can be said to be meaningful in that Najuson ship might be King Taejo’s Nuson which was used to attach Naju in the 10th century.

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