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A Study On Application Of Satellite Remote Sensing In Marine Fishing-Ground Analysis And Fishing Condition Forecasting--A Case Of Ommastrephes Bartrami Fisheries In Northwest Pacific Ocean

Posted on:2005-12-04Degree:DoctorType:Dissertation
Country:ChinaCandidate:W FanFull Text:PDF
GTID:1103360122993610Subject:Physical geography
Abstract/Summary:PDF Full Text Request
The fishing-grounds of Neon flying squid in Northwest Pacific Ocean are one of the most important high sea fisheries of our country. The information of fishing-ground analysis and fishing-condition forecasting are helpful to reduce oil consuming and cut down production cost, and also are useful to increase catch and augment production value. Presently, fisheries resources of our county were declining continuously in continental shelf ocean area and developing high sea fisheries was inevitable. So it is significant for study of fishing-ground forecasting and fishing-analysis by integrated using satellite remote sensing, geographical information system and artificial intelligent technology.An application of marine environment factors drived from satellite remote sensing in marine fisheries is the main clue of this thesis. Based on an example of the neon flying squid of the North Pacific, The principle, retrieve methods and application of marine environment factors drived from satellite remote sensing in fisheries were summarized in the thesis. Based on the study of the time-spatial distribution of the neon flying squid and its relationship with marine environment factors, the fishing-ground analysis and fishing condition forecasting system of the neon flying squid (Ommastrephes bartrami) in the North Pacific was developed with ComGIS and case-based reasoning technology. The contribution of the dissertation work is as follows:Firstly, according to the relationship between fishing-ground and environment factors, fishing-ground formation mechanism, the fishing-ground types classifying and retrieved methods of satellite remote sensing for marine environment factors(SST, Chl-a, SSH, current), the development of satellite remote sensing and its application in marine fisheries also was generalized.Secondly, the time-spatial distribution of fishing-ground of neon flying squid was studied. The biological characteristic, migration and the habit of neon flying squid were summarized, as well as the development history of neon flying squid and the status of our country's development in neon flying squid were summed up. The basis characteristic of meteorology, hydrology and seabed topography were analyzed, and emphasizing the variation rules and structure characteristic of Kuroshio current and Oyashio current. According to the three level data of SST, chlorophyll-a and SSH supplied by NASA, as well as floating data of ARGO, with the visualization and mapping of GIS, the distribution and its variation of SST, chlorophyll-a and SSH and vertical distribution of subsurface temperature were studied. Based on the collected data of catch and constructing of production database, resources abundance, formation frequency of fishing-ground, variation of fishing-ground with latitude and longitude was calculated. The geostatisticswere also introduced for quantitative studying the spatial pattern of neon flying squid. The results showed that the spatial pattern of neon flying squid in the west of 170 E are caused by spatial correlation, and the stochastic variation is very small.Thirdly, the relationship between fishing-ground or neon flying squid resources and marine environment factors was studied quantificationally. By statistics analysis and generalized additive models (GAM) fitting, the statistical characteristics of neon flying squid catch with SST, chlorophyll-a and SSH were found. It showed that the favorite temperature of neon flying squid is 15-17C and the scope of favorable temperature is 10-22C. The scope of chl-a concentration is about 0.1-0.6mg/m3 in fishing-ground area, and the chl-a concentration is about 0.12-0.14mg/m3 when fishing-ground were most often formed. SSH is often large than 0 from July to November and SSH is often less than 0 in spring and the beginning of summer. The correlation of catch with SST is low in June and the positive correlation is high from July to August, however, the correlation is negative in October and November. The correlation of catch with chl-a is negative, namely the larger of catch,...
Keywords/Search Tags:Northwest Pacific Ocean, Fishing-ground analysis, Neon flying squid(Ommastrephes bartrami), Satellite remote sensing, Fishing conditon forecasting, Sea surface temperature, Chlorophyll-a, Sea surface height, Spatial distribution
PDF Full Text Request
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