@article{oai:doshisha.repo.nii.ac.jp:00023102,
 author = {開川, 信一郎 and Kaikawa, Shinichiro and 池田, 陽紀 and Ikeda, Yoki and 長岡, 直人 and Nagaoka, Naoto},
 issue = {4},
 journal = {同志社大学理工学研究報告, The Science and Engineering Review of Doshisha University},
 month = {Jan},
 note = {数値電磁界解析手法の一つである時間領域差分法(FDTD法)を用いて水中における電流分布を明らかにした。雷電流は表皮効果により海面付近の浅い部分に集中し、その傾向は海水の塩分濃度が大となるほど顕著となる。一方、塩分濃度が小であるほど、雷電流は海底方向へと侵入する。海上を航行する船舶は耐雷対策のため、雷電流は海面付近の浅い部分にて海中へと放出し、機器の接地は可能な限り深い部分で取る必要がある。湖や河川を航行する船舶は、淡水における表皮厚を考慮すると、独立接地を取ることは難しい。接地抵抗を小とするため、雷保護用接地板の面積は可能な限り大とするべきである。, Lightning current distribution into water is clarified by means of finite difference time domain (FDTD) method, which is one of numerical electromagnetic analysis methods. The lightning current is concentrated on the sea surface due to skin effect. The tendency becomes notable with the increase of salinity of seawater. On the other hand, the lightning current diffuses toward the seabed with the decrease of the salinity. A ship on the sea has to release a lightning current into a surface portion of seawater, and has to have earth-plate(s) for grounding installed apparatus as deep as possible to protect from a lightning. The independent earthing is difficult to realize for the ship on the lake or river due to the skin depth of the freshwater. The area of the earth-plate for the lightning protection should be increased as much as possible to decrease its grounding resistance., application/pdf},
 pages = {349--354},
 title = {水中への雷電流拡散様相},
 volume = {55},
 year = {2015},
 yomi = {カイカワ, シンイチロウ and イケダ, ヨウキ and ナガオカ, ナオト}
}