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    • 11. 发明专利
    • GOING-UP SYSTEM OF FISH TO FRESH WATER RESERVOIR
    • JP2000120052A
    • 2000-04-25
    • JP31541898
    • 1998-10-19
    • NATL RES INST OF AGRICULTURAL
    • HATA KENJI
    • E02B8/08
    • PROBLEM TO BE SOLVED: To easily make fish go up to a paddy field having a water level higher than a channel by a simple constitution and to make it possible to make various kinds of living things live. SOLUTION: A drain 13 located at a position lower than the water level of a fresh water reservoir 12 and the fresh water reservoir 12 are connected with a fish way 10. The fresh water is supplied to the fresh water reservoir 12 by a pump 14, and the water level is kept in a specific level LV1. The fish way 10 is equipped with a stair-like bottom plate 22 having a fresh water reservoir side flat section located at a position lower than the water level of the fresh water reservoir 12 and having a channel side flat section located at a position lower than the water lever LVn of the drain 13, side walls 23a and 23b provided to both sides of the bottom plate 22 and forming channels inside of them and partition walls 24a-24e forming overflow sections 30 for overflowing water in the upstream side at intervals of the up and down stream sides in the channels. Then, each of the overflow sections 30 is set in such a height H3 as small sized fish can go up against the water level in the upstream side. The water level in the fresh water reservoir side is kept in a specific level LV1, and the height H3 against the water level in the downstream side in each of the overflow sections 30 is equivalent to such a depth as the small sized fish can go up.
    • 12. 发明专利
    • LABYRINTHINE FIXED WEIR UNIT
    • JPH11336053A
    • 1999-12-07
    • JP16434398
    • 1998-05-28
    • NATL RES INST OF AGRICULTURALISHIKAWAJIMA HARIMA HEAVY INDKURIMOTO LTDMARSIMA AQUA SYSTEM CORP
    • TSUNESUMI NAOTOKATO TAKASHINAKANISHI NORIOGOTO MITSUTOSHIHOJO KATSUYAKAMIIDE KOZO
    • E02B7/02
    • PROBLEM TO BE SOLVED: To improve workability by a method wherein the planate shape of an overflow section is formed in a projecting-retreating shape that alternately projects forward and retreats rearward, and members equipped respectively with specified pitches for projection and retreat are connected together in the breadthwise direction of a watercourse. SOLUTION: A labyrinthine fixed weir 1 is constructed with a weir body 10 erected between side walls 30 of a watercourse, and water overflowing the top thereof is made to flow from the upstream side to the downstream side. The weir body 10 is formed in a structure wherein diagonal weir bodies 10B arranged alternately in reversed gradient in planeness are connected respectively with upstream-side weir bodies 10F and downstream-side weir bodies 10R, and triangular wavelike shapes continuing at specified pitches are formed. Then, a unit weir body 10A in a triangular shape projecting toward the upstream side of the weir body 10 is made to serve as a unit structural member 20, and a fixed weir 1 is formed by connecting a plurality of such structural members in the breadthwise direction of the watercourse. The member 20 is formed by erecting the unit weir body 10a at the upside of a base 21. Since the planate shape is formed in zigzag, overflow rate per unit overflow width becomes large and furthermore, the unit structural members manufactured at a factory can be connected at a construction site to correspond to optional length of the weir and construction can be executed easily in a short period of time.
    • 18. 发明专利
    • WATER PENETRATION TESTING DEVICE
    • JPH11211649A
    • 1999-08-06
    • JP2639998
    • 1998-01-23
    • NATL RES INST OF AGRICULTURAL
    • TOYODA HIROMICHINAGATSUKA ISAMUMORIYAMA HIDEKI
    • G01N15/08G01N33/24
    • PROBLEM TO BE SOLVED: To evaluate the water penetration performance of a water penetration material in a different execution state by arbitrarily selecting a desired site. SOLUTION: A sample container 2 is accommodated in a cylindrical body 3 so that it can be exchanged. In the sample container 2, a transparent cylindrical wall 10 and a thin hole 13 are provided with a bottom plate 11 with a number of punched holes. O rings 1416 are arranged at the bottom plate 11, and the bottom plate 11 is divided into specific regions A1 -A4 . Based on an execution condition for each of the divided regions A1 -A4 of the bottom plate 11, bentonite water penetration materials 17 are joined mutually in different states and are laid. In the sample container 2 where the sample 17 is created, water is introduced from a high-pressure water supply control device 40 after curing. A group of pores 13 corresponding to the regions A1 -A4 are selected arbitrarily and are l connected to a load cell 43, and the amount of water leakage from the regions A1 -A4 corresponding to the samples with different execution state is measured by the load cell 43, thus evaluating a water penetration performance.
    • 19. 发明专利
    • FILL DAM CONTROL SYSTEM BY SPECIFIC RESISTANCE TOMOGRAPHY METHOD AND ITS CONTROL METHOD
    • JP2000338258A
    • 2000-12-08
    • JP15173999
    • 1999-05-31
    • NATL RES INST OF AGRICULTURAL
    • NAKAZATO HIROMINAGATSUKA ISAMUNAKAJIMA KENJIRO
    • G01V3/20
    • PROBLEM TO BE SOLVED: To control a dam inexpensively over a long term with a simple configuration. SOLUTION: A temperature sensor 6 for detecting the temperature of a fill dam 3 and electrodes Pa1-Pan and Pb1-Pbn for detecting specific resistance are buried into the fill dam 3 in advance when the fill dam 3 (4, 3A) is to be constructed by obtaining the relationship among the specific resistance and each physical property of temperature, gap ratio, and saturation by an experiment in advance and acquiring the basic elements for analysis and abnormality judgment. After the fill dam 3 is completed, temperature data that is collected from the temperature sensor 6 being buried into the fill dam 3 and potential data that is measured by an electrical prospecting device 2 are processed by a computer 5 for creating a temperature distribution and a specific resistance distribution with time, then the created physical property distribution and specific resistance distribution are compared based on a relation expression that is obtained by an experiment in advance, it is judged whether the change in the specific resistance distribution is abnormal or normal based on the comparison, and an abnormal site is detected according to the region of the specific resistance region when it is judged to be abnormal.
    • 20. 发明专利
    • LABYRINTHINE MOVABLE WEIR
    • JPH11336058A
    • 1999-12-07
    • JP16434198
    • 1998-05-28
    • NATL RES INST OF AGRICULTURALISHIKAWAJIMA HARIMA HEAVY INDKURIMOTO LTDMARSIMA AQUA SYSTEM CORP
    • TSUNESUMI NAOTOKATO TAKASHINAKANISHI NORIOGOTO MITSUTOSHIHOJO KATSUYAKAMIIDE KOZO
    • E02B7/34
    • PROBLEM TO BE SOLVED: To improve function by a method wherein a labyrinthine weir edge body formed as seen in the planate view in a shape projecting alternately forward and rearward is provided at an overflow section at the upper edge of an opening/shutting door leaf. SOLUTION: For instance, a door leaf 10 is provided at a place between bearing walls 2 forming a watercourse so that the door leaf can be lifted up and down, and a roller gate 1 is constructed with a labyrinthine overflow section 20 provided at the upside of the door leaf main body. The overflow section 20 is formed by erecting a weir board body 21 in a triangular wavelike shape projecting alternately toward the upstream side and the downstream side as seen in the planate view at a top board 11B provided at a place between side pillars of the door leaf main body. The door leaf 10 checks water at a closing position contacting with the river bed surface 3 while letting water overflowing the overflow section 20 flow for keeping the water level constant, and when the amount of inflow increases abruptrly because of a flood or the like, the door leaf 10 is raised and water is discharged through a space between the lower edge of the door leaf and the river bed surface 3. As the length of the weir becomes long because of the zigzagging shape at the labyrinthine overflow section, discharge capacity can be made large while reducing man power and cost without requiring the gate to be built in a double stage structure and furthermore, the water level at the upper stream can be made constant.