CN102102971B - Method for measuring towing depth of mid-water trawl warp - Google Patents

Method for measuring towing depth of mid-water trawl warp Download PDF

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Publication number
CN102102971B
CN102102971B CN2009102015265A CN200910201526A CN102102971B CN 102102971 B CN102102971 B CN 102102971B CN 2009102015265 A CN2009102015265 A CN 2009102015265A CN 200910201526 A CN200910201526 A CN 200910201526A CN 102102971 B CN102102971 B CN 102102971B
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China
Prior art keywords
protractor
pointer
warp
guiding principle
clamping plate
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Expired - Fee Related
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CN2009102015265A
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Chinese (zh)
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CN102102971A (en
Inventor
冯春雷
张勋
周爱忠
黄洪亮
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East China Sea Fishery Research Institute Chinese Academy of Fishery Sciences
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East China Sea Fishery Research Institute Chinese Academy of Fishery Sciences
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Priority to CN2009102015265A priority Critical patent/CN102102971B/en
Publication of CN102102971A publication Critical patent/CN102102971A/en
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Publication of CN102102971B publication Critical patent/CN102102971B/en
Expired - Fee Related legal-status Critical Current
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Abstract

The invention discloses a method for measuring towing depth of a mid-water trawl warp, and relates to position determination of a trawl warp. In the method, a protractor and a pointer are adopted, the protractor is characterized by being fixed among three splints, the external splint on the front side of the protractor and positions corresponding to scales of the protractor are provided with circular-arc slotted holes, the pointer is arranged in the centre of a circle on the scales of the protractor, a pencil insert hole is arranged at the lower part of the pointer, the center distance between a circular hole on the upper part of the pointer and the lower pencil insert hole is equal to the circular arc radius of the scales of the protractor, a measuring appliance is installed on the warp to measure a maximum angle alpha and a minimum angle beta of the warp. According to readings of the protractor, the terminal depth of the warp close to a net can be calculated with a formula shown in the specification, in the formula, D denotes the terminal depth of the warp close the net in m; S denotes a connection length of a warp towing point and the net in m; and s denotes the vertical height of the warp towing point away from the water level in m.

Description

Middle layer trawl drags guiding principle towing degree of depth assay method
Technical field
The present invention relates to the sea fishery trawling and drag the mensuration of guiding principle position.
Background technology
Middle layer trawl is the mode of mainly fishing for of China's trawl-net fishing, divides single ship and two two kinds of operating types of ship, and main fishes for liking pelagic fishes or siphonopods.Trawlnet generally requires towing speed about 3.5~4.0kn.After fish detector detected fish school trace, trawlnet should aim at shoal of fish towing.Whether the towing degree of depth of trawlnet or net position directly influence the fishery harvesting effect with shoal of fish level.
Net position-finding to middle layer trawl at present mainly contains netsonde mensuration and his ship auxiliary measuring dual mode.It is through at web plate or each main position sensor installation of netting gear that netsonde is measured, and characterizes the towing degree of depth of netting gear apart from the vertical range of the water surface through the transmitted wave determination sensor.The netsonde device is mainly by foreign-made, and the netsonde measurement has accurate, real-time advantage, and shortcoming is that cost is higher, and like the SCANMAR wireless type trawl monitor of Norway, a complete set of price is about about 400,000 dollars.In addition, the trawlnet that sensor is housed is had relatively high expectations to working the operation of putting net, to avoid the damage of sensor.The mode of his ship subsidiary is in normal towing process, by his ship process trawlnet top, utilizes fish finder to measure the depth of implements of netting gear.Utilize other ships to come subsidiary net position, though cost is relatively low, practical operation is trouble, and precision is not high, can't guarantee that position that fish finder is surveyed is the headline or the network interface position of netting gear.
In China, except that the middle layer trawl in coastal waters, some ocean or the large-scale phantom trawler of mistake ocean property., except that above-mentioned dual mode, still rely on the captain greatly and utilize experience to estimate the net position for the net position-finding of trawlnet.At present, go back simple, effective, the cheap trawlnet net position measuring appliance of neither one.
Summary of the invention
The purpose of this invention is to provide a kind of trawlnet and drag guiding principle towing degree of depth assay method, utilize and record the angle of draging guiding principle, and obtain the towing degree of depth of trawlnet through data reduction.
Technical scheme of the present invention adopts protractor, pointer; It is characterized in that protractor is fixed between three clamping plate, promptly establish clamping plate at the protractor back side, two clamping plates is established in the front; Wherein, The positive outer field clamping plate of the protractor position corresponding with the protractor scale mark is shaped on the slotted eye of circular arc, and four jiaos of same positions of three clamping plate are equipped with fixed screw fixed amount hornworks with big or small identical circular holes, and three clamping plate and protractor are shaped on the pointer mounting hole according to the home position of protractor scale mark; Pointer is contained in the laminated plank outside outside the protractor front; Pointer top has circular port distribution axle pointer to be contained in the pointer mounting hole of above-mentioned three clamping plate and protractor; The pencil jack is arranged at the pointer bottom, and the centre distance of the circular port on pointer top and bottom pencil jack equals the arc radius of protractor scale mark; The measuring appliance of forming as stated above is contained in and drags on the guiding principle, records and drags guiding principle maximum angle and angle with smallest, according to the protractor reading, drags guiding principle and draws through computes near the terminal degree of depth of netting gear: D = S × Cos α + β 2 - s In the formula: D drags the terminal degree of depth of guiding principle near netting gear, unit: m; S is for draging guiding principle towpoint and netting gear junction length, unit: m; S drags the vertical height of guiding principle towpoint apart from the water surface, unit: m; α be measure maximum angle (unit: degree); β be measure minimum angles (unit: degree).
Outstanding advantage of the present invention be simple to operate, measure effectively, the utensil manufacturing cost is cheap; In actual measurement; The measuring appliance that assembles is contained in drags on the guiding principle,, can drag the towing degree of depth of guiding principle by snatch near netting gear one end through mathematical computations according to the protractor reading of pointer indication.
Description of drawings
Fig. 1 is a protractor; Fig. 2, Fig. 3 are clamping plate; Fig. 4 is the clamping plate that are shaped on arc-shaped slot; Fig. 5 is a pointer; Fig. 6 is a measuring appliance; Fig. 7 is an instrumentation plan.
Embodiment
Draging guiding principle towing angle measuring appliance adopts protractor, clamping plate, pointer to combine.Fig. 1, Fig. 2, Fig. 3, Fig. 4, Fig. 5 are measuring appliance part broken away view.The length of protractor A is L among Fig. 1, highly is H, L=50cm, H=35cm; Length, the width with Fig. 1 protractor A is identical respectively for the length of Fig. 2, Fig. 3, three clamping plate B of Fig. 4, C, D, width dimensions, i.e. L=L1=L2=L3, H=H1=H2=H3.Protractor scale mark place home position has pointer mounting hole a, and the diameter of mounting hole a is 0.8cm; The same position of three clamping plate B, C, D has size three circular hole bs, c, the d identical with pointer mounting hole a.In addition, the Si Jiaochu of three clamping plate has position, big or small identical circular hole, and four jiaos of place's Circularhole diameters of three clamping plate are 1cm; Be used for fixing clamping plate and protractor.Outer field clamping plate D shown in Figure 4 has arc-shaped slot e, 5~175 ° of the circular arc scopes of slotted eye e, and the width of slotted eye e is 5cm, the arc point midway is identical with protractor scale mark point midway.The pointer mounting hole is arranged at pointer top shown in Figure 5, and the bottom has size to be the identical circular hole in conventional pencil cross section.The distance of center circle of the mounting hole on pointer top and bottom circular hole equals the radius that protractor A scale mark belongs to circular arc from L4, and the scale mark radius of circle of protractor is 18cm, and pointer is contained in the clamping plate D outside.
In the actual measurement, the measuring appliance that assembles is contained in drags on the guiding principle, because fishing boat has certain rocking in the actual measurement, so reading scope often, minimum and maximum angle is respectively α, β.According to the protractor reading, drag guiding principle and draw through computes near the terminal degree of depth of netting gear: D = S × Cos α + β 2 - s In the formula: D drags the terminal degree of depth (unit: m) of guiding principle near netting gear; S is for draging guiding principle towpoint and netting gear junction length (unit: m); S drags the vertical height (unit: m) of guiding principle towpoint apart from the water surface; α be measure maximum angle (unit: degree); β be measure minimum angles (unit: degree).

Claims (1)

1. middle layer trawl drags guiding principle towing degree of depth assay method; Adopt protractor, pointer; It is characterized in that protractor is fixed between three clamping plate, promptly establish clamping plate at the protractor back side, two clamping plates is established in the front; Wherein, The positive outer field clamping plate of the protractor position corresponding with the protractor scale mark is shaped on the slotted eye of circular arc, and four jiaos of same positions of three clamping plate are equipped with fixed screw fixed amount hornworks with big or small identical circular holes, and three clamping plate and protractor are shaped on the pointer mounting hole according to the home position of protractor scale mark; Pointer is contained in the laminated plank outside outside the protractor front; Pointer top has circular port distribution axle pointer to be contained in the pointer mounting hole of above-mentioned three clamping plate and protractor; The pencil jack is arranged at the pointer bottom, and the centre distance of the circular port on pointer top and bottom pencil jack equals the arc radius of protractor scale mark; The measuring appliance of forming as stated above is contained in and drags on the guiding principle, records and drags guiding principle maximum angle α and angle with smallest β, according to the protractor reading, drags guiding principle and draws through computes near the terminal degree of depth of netting gear:
D = S × cos α + β 2 - s
In the formula: D drags the terminal degree of depth of guiding principle near netting gear, unit: m;
S is for draging guiding principle towpoint and netting gear junction length, unit: m;
S drags the vertical height of guiding principle towpoint apart from the water surface, unit: m.
CN2009102015265A 2009-12-21 2009-12-21 Method for measuring towing depth of mid-water trawl warp Expired - Fee Related CN102102971B (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN2009102015265A CN102102971B (en) 2009-12-21 2009-12-21 Method for measuring towing depth of mid-water trawl warp

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN2009102015265A CN102102971B (en) 2009-12-21 2009-12-21 Method for measuring towing depth of mid-water trawl warp

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CN102102971A CN102102971A (en) 2011-06-22
CN102102971B true CN102102971B (en) 2012-08-22

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Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN109975067B (en) * 2019-04-16 2020-07-28 中国水利水电科学研究院 Water body sample sampling depth correcting device

Citations (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN2084010U (en) * 1990-09-20 1991-09-04 孙谦怀 Multipurpose ruler
CN2084605U (en) * 1991-01-29 1991-09-11 李万春 Simple high latitude instrument
CN2095398U (en) * 1991-06-26 1992-02-05 胡成章 Multiprupose measuring rule
CN2372227Y (en) * 1998-10-26 2000-04-05 大连水产学院 Net mouth height measuring instrument
CN2413918Y (en) * 1999-12-07 2001-01-10 胡抒 Teaching aid with pointer capable of measuring angle
CN2503457Y (en) * 2001-09-03 2002-07-31 史云鹏 Slope measuring instrument
CN1932554A (en) * 2006-10-11 2007-03-21 中国海洋石油总公司 Marine tow line array double-wing automatic fixing depth device
CN201140627Y (en) * 2007-10-17 2008-10-29 公凡祥 Angle-drawing instrument
CN201191183Y (en) * 2008-05-26 2009-02-04 龚双龙 Optical height measuring equipment
CN201322616Y (en) * 2008-12-26 2009-10-07 刘恩乐 Measuring instrument

Patent Citations (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN2084010U (en) * 1990-09-20 1991-09-04 孙谦怀 Multipurpose ruler
CN2084605U (en) * 1991-01-29 1991-09-11 李万春 Simple high latitude instrument
CN2095398U (en) * 1991-06-26 1992-02-05 胡成章 Multiprupose measuring rule
CN2372227Y (en) * 1998-10-26 2000-04-05 大连水产学院 Net mouth height measuring instrument
CN2413918Y (en) * 1999-12-07 2001-01-10 胡抒 Teaching aid with pointer capable of measuring angle
CN2503457Y (en) * 2001-09-03 2002-07-31 史云鹏 Slope measuring instrument
CN1932554A (en) * 2006-10-11 2007-03-21 中国海洋石油总公司 Marine tow line array double-wing automatic fixing depth device
CN201140627Y (en) * 2007-10-17 2008-10-29 公凡祥 Angle-drawing instrument
CN201191183Y (en) * 2008-05-26 2009-02-04 龚双龙 Optical height measuring equipment
CN201322616Y (en) * 2008-12-26 2009-10-07 刘恩乐 Measuring instrument

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