CAJ | 학술논문

根据2014年11月使用SDKN-500型网位仪所采集的罩网作业时网口深度和间距的实时数据，分析罩网网口沉降与闭合性能。结果发现：1）渔船绞收网口纲后，网口沉降和闭合速度不会马上突变，存在120.7 s的滞后时间；2）网口降至最大深度时（平均82.0 m），仍未完全闭合，此后深度相对稳定，直至网口完全闭合（平均68.0 s）并停滞一段时间（平均9.8 s）后网口才开始上升；3）渔船不同作业状态可分为开始放网（设为0 s）、开始绞收网口纲（平均104.0 s）、网口加速闭合（平均224.7 s）、网口达最大深度（平均266.6 s）、网口完全闭合（平均334.6 s），也是决定罩网性能的5个关键时间节点；4）4个时段的网口沉降速度分别为0.419 m·s-1、0.238 m·s-1、0.233 m·s-1和-0.021 m·s-1，总体呈递减趋势，沉降中期存在波动；5）4个时段的网口闭合速度分别为0.103 m·s-1、0.105 m·s-1、0.253 m·s-1和0.424 m·s-1，总体呈递增趋势；整个沉降过程闭合速度在前期先变大后变小，在沉降后期明显加大。建议提高网口纲绞收速度以避免鱼群逃逸。
근거2014년11월사용SDKN-500형망위의소채집적조망작업시망구심도화간거적실시수거，분석조망망구침강여폐합성능。결과발현：1）어선교수망구강후，망구침강화폐합속도불회마상돌변，존재120.7 s적체후시간；2）망구강지최대심도시（평균82.0 m），잉미완전폐합，차후심도상대은정，직지망구완전폐합（평균68.0 s）병정체일단시간（평균9.8 s）후망구재개시상승；3）어선불동작업상태가분위개시방망（설위0 s）、개시교수망구강（평균104.0 s）、망구가속폐합（평균224.7 s）、망구체최대심도（평균266.6 s）、망구완전폐합（평균334.6 s），야시결정조망성능적5개관건시간절점；4）4개시단적망구침강속도분별위0.419 m·s-1、0.238 m·s-1、0.233 m·s-1화-0.021 m·s-1，총체정체감추세，침강중기존재파동；5）4개시단적망구폐합속도분별위0.103 m·s-1、0.105 m·s-1、0.253 m·s-1화0.424 m·s-1，총체정체증추세；정개침강과정폐합속도재전기선변대후변소，재침강후기명현가대。건의제고망구강교수속도이피면어군도일。
Based on the real-time data of sinking depth and distance of net mouth of falling-net by SDKN-500 net monitor in November 2014,we analyzed the sinking and closing performance of falling-net. The results show that:1)The sinking and closing speeds would not mutate when pursing the purse line with retardation time of 120. 7s;2)The net mouth was not completely closed when it reached the maximum depth( averagely 82. 0 m),and did not rise up until it was completely closed( averagely 68. 0 s)and stayed for a while (averagely 9. 8 s);3)The different operating conditions could be divided into the shooting time(0 s),the pursing time(averagely 104. 0 s),the time when the closing speed mutated( averagely 224. 7 s),the time when the net mouth reached the maximum depth ( averagely 266. 6 s)and the time when the net mouth was completely closed( average 334. 6 s)in sequence,which were the five key time nodes determining the fishing performance of falling-net;4 )The sinking speeds of the four periods were 0. 419 m·s-1 ,0. 238 m·s-1 ,0. 233 m·s-1 and -0. 021 m·s-1 ,respectively,showing a decreasing trend with fluctuation in the middle of settlement;5)The closing speeds of the four periods were 0. 103 m·s-1 ,0. 105 m·s-1 ,0. 253 m·s-1 and 0. 424 m·s-1 ,respectively,showing an increasing trend. The closing speed of net mouth increased firstly and then decreased at the beginning of settlement,and the closing speed showed a significant increasing trend in the later period of settlement. It is suggested to increase the hauling speed to avoid fish escape.