Concave deck ship - Oukouhansen

Japanese: 凹甲板船 - おうこうはんせん

…In general, if a commercial ship has a superstructure above the upper deck, it has a superstructure deck, the forecastle deck is called the forecastle deck, and the poop deck is called the poop deck. These superstructures give the ship's hull a distinctive shape, and if there is no superstructure, it is called a flat-deck ship, if there is only a forecastle, it is called a flat-deck ship with forecastle, if there are both, it is called a sunken or well-deck ship, and if there are superstructures near the center of the ship in addition to the bow and stern, it is called a three-deck ship. There are multiple decks on the upper deck or the superstructure deck for the deckhouses, and the top deck with the wheelhouse is called the navigation bridge deck, and its roof is called the compass deck. …

From [ship type]

… Most merchant ships, which make up the majority of ships, are of the displacement type, but the general shape of the upper part is determined by the side shape and the location of the bridge and engine room. Depending on the presence and location of the superstructure (the part of the deck that is one step higher), the side shape is classified into flat-deck ships without a superstructure, flat-deck ships with a forecastle that is basically flat-deck ships but has a forecastle to improve seaworthiness, well-deck ships with a superstructure at the bow and stern on the upper deck, and three islanders with a superstructure at the bow, center, and stern on the upper deck. Depending on the location of the bridge and engine room, they are classified into aft-bridge aft engine room type, center-bridge center engine room type, and semi-aft bridge engine room type. …

*Some of the terminology used to refer to "concave deck ships" is listed below.

Source | Heibonsha World Encyclopedia 2nd Edition | Information

Japanese:

…一般商船で上甲板上に船楼が存在する場合には船楼甲板が設けられ，船首楼の甲板を船首楼甲板，船尾楼の甲板を船尾楼甲板と呼ぶ。これら船楼は船体の側面形状に特徴を与え，船楼がない場合を平（ひら）甲板船，船首楼のみの場合を船首楼付平甲板船，両方が存在する場合を凹甲板船またはウェル甲板船，船首尾以外に船体中央部付近にも船楼をもつものを三島型船と呼んでいる。上甲板上あるいは船楼甲板上には甲板室のために複数の甲板が設けられるが，このうち最上層の操舵室のある甲板を航海船橋甲板，その屋根をコンパス甲板という。…

【船型】より

…　船の主要な部分を占める商船は，ほとんど排水量型の船型であるが，側面形状と船橋および機関室の配置によって，上部の概略の形が規定される。側面形状は船楼(甲板が一段高くなっている部分)の有無と位置によって，船楼をもたない平甲板船，基本的には平甲板船であるが凌波（りようは）性を高めるために船首楼を有する船首楼付き平甲板船，上甲板上の船首と船尾に船楼をもつ凹甲板船(ウェル甲板船)，上甲板上の船首，中央および船尾に船楼をもつ三島船three islanderなどに分類される。船橋と機関室の位置によっては，船尾船橋船尾機関室型，中央船橋中央機関室型，準船尾船橋機関室型などに分類される。…

※「凹甲板船」について言及している用語解説の一部を掲載しています。

出典｜株式会社平凡社世界大百科事典第２版について | 情報

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