EFFECT OF WATER FLOW ON LARVAL SETTLEMENT IN THE NAGURA AMPARU TIDAL LAGOON
This study analyses settlement process of megalopa, which is final stage of crab larva, on a tidal lagoon based on population sampling of juvenile crabs and numerical simulation of larval settlement. Population sampling was carried out 3 times in settlement period, detailed distribution of the juveniles were grasped. The observed results indicated many megalopae have settled down at around points of 0.2 meters elevation. In addition, it seemed that the positions where many juveniles inhabited are near stagnation point. Then, to grasp the relationship between larval settlement and flow field, numerical tracer chasing by 2-D Lagrangian model was conducted. This study brought up tractive force as settlement parameter of tracer. By comparison the distribution, the calculated result with considering tractive force agreed with the observed result. Additionally, the results in spring tide are more reasonable than neap and middle tides, thus, megalopae may reinvade to the lagoon and settle down in the spring tide practically.
water flow megalopa larval settlement Lagrangian method tractive force
Atsushi Kawachi Tadaharu Ishikawa
Tokyo Institute of Teenology, 4259 Nagatsuta-cho Midori-ku Yokohama, Kanagawa, Japan Tokyo Institute of Tecnology, 4259 Nagatsuta-cho Midori-ku Yokohama, Kanagawa, Japan
国际会议
第16届亚太地区国际水利学大会暨第3届水工水力学国际研讨会(16th IAHR-APD Congress and 3rd Symoposium of IAHR-ISHS)
南京
英文
1382-1387
2008-10-20（万方平台首次上网日期，不代表论文的发表时间）