Akiyama  Juichiro

Ogata  Ryo

Onitsuka  Kouki

Kyutacar : Kyushu Institute of Technology Academic Repository

Effects of boulder interval over pool bed inpool-and-weir fishway on migration rate ofoikawa, Zacco platypus著者 Onitsuka  Kouki, Akiyama  Juichiro, Ogata  Ryojournal orpublication title12th International Symposium on Particle ImageVelocimeteryyear 2017-06URL http://hdl.handle.net/10228/00006752ISPIV2017 The 12th International Symposium on Particle Image Velocimetery June 19 (Mon) – 21 (Wed), 2017 / Grand Hotel, Busan, Korea  EFFECTS OF BOULDER INTERVAL OVER POOL BED IN POOL-AND-WEIR FISHWAY ON MIGRATION RATE OF Oikawa, Zacco PLATYPUS   Kouki Onitsuka1, Juichiro Akiyama2 and, Ryo Ogata2   1 Department of Civil Engineering, Kyushu Institute of Technology,Kitakyushu,804-8550,Japan onitsuka@civil.kyutech.ac.jp  2 Department of Civil Engineering, Kyushu Institute of Technology,Kitakyushu,804-8550,Japan ABSTRACT  1.INTRODUCTION  Dam is constructed for the purpose of water control and water utilization. However, the construction blocks fish’s migration that seeks to upstream. This is problem for migratory fishes in river. Therefore, fishway is constructed in their rivers in order to comfort migration of fishes. The most of fishway in Japan is pool-and-weir fishway [1]. Pool-and-weir fishway has notch at weir wall. Width of notch is generally twenty or thirty percent of weir wall’s one. In calm river, over flow arise from only notch, so there is high speed flow at point of fall. Fish’s swimming speed is roughly divided into two types: sustained speed and burst speed [2]. The latter causes of fatigue. In case of migration at pool-and-weir fishway, fish sometimes use burst speed. Therefore, it is necessary to keep resting area in the pool [1]. One of the method is establishment of boulder. In Aki-gawa River, It was confirmed that boulder has affected kind and number of the migrated fish. [3, 4]. It was confirmed that the large size boulder at bottom of pool decreases the time for migrating [5, 6].It was confirmed that Iwana (Salvelinus leucomaenis leucomaenis) go through around the boulder at migration [7].It was confirmed that Oikawa (Zacco platypus) swims between boulders [8]. It is necessary to investigate boulder’s effect on migrating behaviors of Oikawa in the pool. And also making suitable area in easy way is important. In this study, migrating behaviors of Oikawa in pool-and-weir fishway were compared with boulders interval at the bottom of pool-and-weir fishway changed.  2. MATERIALS AND METHODS  Figure. 1 shows pool-and-weir fishway. It was designed following. Pool length (L) was 0.7m and width (B) was 0.6m. The pool was connected in a staircase pattern. Thickness of the partition wall (Δx) was 0.15m, pool drop (Δy) was 0.15m and notch width (Δz) was 0.16m. Pool number was in ascending order toward upstream. Figure. 2 shows location of boulders which was inserted in second pool. In this study, the shape of the boulder was spherical [9]. 20 Oikawa average length is 70mm were put into the second pool. Discharge was maintained at 7 (l/s). Table. 1 shows experimental case. Experiments were performed 4 cases in total. After having accustomed fish for flow, recording was began with the video camera from the sidewall and the upper part of the fishway for 20 minutes. Number of migration and swimming position, was analyzed after recording. Further, flow velocity was measured using 3D electromagnetic velocity meter.  3. RESULTS AND DISCUSSION  This study provided the following knowledge. Figure 3 shows passage time for high speed area for each case. The larger boulder interval is, the larger void is in an area below the top of boulder. In this area, the flow velocity was lower than above the top of boulder. Therefore, Oikawa used them as resting area. In addition, the larger boulder interval became, the less fish swam high speed area before migration. As a result, it was thought that fatigue was reduced and migration rate become high. Figure 4 shows migration rate ( Nnm ) of Oikawa for each case.  REFERENCES   [1] Nakamura S “Gyodou no Hanashi” Sankaidou (1995) pp.42-49  [2] Sanz-Ronda F.J., Ruiz-Legazpi J., Bravo-Córdoba F.J., Makrakis S., Castro-Santos T. “Sprinting performance of two Iberian fish: Luciobarbus bocagei and Pseudochondrostoma duriense in an open channel flume” Ecological Engineering 83 (2015) pp.61-70  [3] Kaneko Y., Izumi K., Tuthiya M., Otake Y. “Hydraulic Characteristics and Ascending Effectiveness of the Fishways in Akigawa River” Annual Journal of Hydraulic Engineering, JSCE. 41 (1997) pp.265-270  [4] Takasaki T., Tsuchiya M., Otake Y. “Efficiency of the Complex Style Fishways for Fish Migration Behavior in Aki-gawa River” Advances in River Engineering 5 (1999) pp.165-170  [5] Santos J.M., Branco P., Silva A.T., Katopodis C., Pinheiro A., Viseu T., Ferreira T. “Effect of two flow regimes on the upstream movements of the Iberian barbel (Luciobarbus bocagei) in an experimental pool-type fishway” Journal of Applied Ichthyology 29 (2013) pp.425-430  [6] Santos J.M., Branco P., Katopodis C., Ferreira T., Pinheiro A. T. “Retrofitting pool-and-weir fishways to improve passage performance of benthic fishes” Ecological Engineering 73 (2014) pp.335-344  [7] Miyazono M. and Tomatsu O. “Arrangement of Protruding Boulders in a Slanted Fishway” Journal of the Japan Society of Erosion Control Engineering 56 1 (2003) pp.3-12  [8] Onitsuka K., Akiyama J., Shishido A., Takamatsu S., Kadota Y., Arisuda T. “Effects of Boulder over Pool Bed on Migration Rate in Pool-and-weir Fishway” Annual Journal of Hydraulic Engineering, JSCE. 72 4 (2016) I_1135-I_1140  [9] Miyazono M., Takauji T., Tomatsu O. “Hydraulic Characteristics and Natatorial Action of Fish Around Boulders” Journal of the Japan Society of Erosion Control Engineering 57 5 (2005) pp.15-24    LBxyflowxzyzhH  Figure 1 Pool-and-weir fishway               Figure 3 Passage time for high speed area                   Figure 4 Migration rate of Oikawa Table 1 Experimental case Table 1 Experimental case  cm5dLBcm15dcm20dcm10dFigure 2 Boulders at bottom of pool  00.10.20.30.52 3 4 5 6 7 8 9 10I5I10I15I20NnLBRmTNn sT 00.20.40.610 5 10 15 200.25Nnm(cm)dratemigration Q (l/s)boulder diameterD  (cm)boulder intervald  (cm)case name5 I510 I1015 I1520 I207 10

Effects of boulder interval over pool bed in pool-and-weir fishway on migration rate of oikawa, Zacco platypus

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Effects of boulder interval over pool bed in pool-and-weir fishway on migration rate of oikawa, Zacco platypus

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