Hydrophone	  (Bed	  load	  monitoring	  system)	  Pipe-­‐type	  Hydrophone:	  660,000JPY*	  Plate-­‐type	  Hydrophone:	  830,000JPY*	  *	   Not	   include	   the	   data	   logger	  	  In	  Japan,	  the	  hydrophone	  that	  a	  microphone	  is	  installed	  into	  the	  pipe	  (Pipe-­‐type	  hydrophone)	  is	  often	   used	   for	   the	   bed	   load	   measurement.	   We	  developed	   the	   hydrophone	   instructed	   by	   Prof.	  
Mizuyama	   at	   Kyoto	   University	   of	   Institute	   of	  Agriculture.	  We	  have	  two	  types	  hydrophone.	  One	  is	  the	  pipe-­‐type	  hydrophone,	  and	  another	  is	  the	  plate-­‐type	   hydrophone.	   The	   pipe-­‐type	  hydrophone	  can	  measure	  smaller	  sedimentation,	  but	  pipe	  is	  sometimes	  dented	  by	  big	  stone	  flow	  of	  flood.	   Once	   the	   pipe	   is	   dented,	   the	   observed	  signals	   become	   big	   and	   the	   pipe	   should	   be	  changed.	   Then,	   we	   develop	   the	   plate-­‐type	  hydrophone	  below	  the	  plate.	  User	  can	  select	  two	  types	  of	  hydrophone.	  
The	  hydrophone	  is	  consisted	  of	  microphone,	  preamplifier,	   pulse	   converter,	   data	   logger	   (10	  channels),	  power	  unit.	  The	  solar	  battery	  unit	  is	  also	  prepared.	  

Pit*sampler
Pipe0type*Hydrophone
Plate0type*Hydrophoneparalleled*with*the*river*bed*slope
Plate0type*Hydrophonetilted*for*the*river*bed*slope
Geophone	  Fig1.	   Experiment	   field	   of	   the	   Ashiarai-­‐dani,	   Hodaka	  Sedimentation	  Observatory	  of	  DPRI,	  Kyoto	  University	  Pipe%type(Hydrophone	  (Manufacture and Sale)
Michinobu Nonaka (Hydrotec Campany)
Tel: +81?748?52?1748
Fax: +81?748?53?1485
E?mail: rishin@hydro.co.jp	  Fig2.	  Experiment	  field	  of	  the	  Shiramizu-­‐dani,	  Hodaka,	  Sedimentation	  Observatory	  of	  DPRI,	  Kyoto	  University	  	  	  Not(include
Pipe%type(Hydrophoneor
Plate%type(Hydrophone

Pulse(converter(10ch(output)

Data(logger

Mobile( router
Communication( tools

Water(level(indicator
Turbidimeter
Current(meter(etc.

Web(cam.

Fig.3	  Block	  diagram	  	  Pipe-­‐type	  Hydrophone	  Plate-­‐type	  Hydrophone	  ⑥
①

⑦

②

④

⑤	  ③	  1.   Pipe	  (0.5m,	  2.0m,	  other)	   	  Outside	  diameter:	  48.6mm,	  (t	  =	  3mm)	  Weight:	  about	  4.5kg	  Quality	  of	  material:	  SUS304	  2.   Saddle	   	  3.   Microphone	  unit	  4.   Pre	  amplifier	  (built-­‐in)	  5.   Microphone	  (built-­‐in)	  6.   Cable	  (mounting	  connector)	  7.   Pulse	  converter	  (10ch	  output)	  Power	  source:	  DC	  12V	  	   	   	   Consumption	  current:	  40mA	  (average)	   	  	  <Observed	  sample>	  Plate	  size:	  50×20cm	  (t	  =	  12mm)	   	  Quality	  of	  material:	  SUS304	  Outer	  size:	  544×274×100mm	  Weight:	  25kg	      !   "



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