简介:BasedonthebiologicalresourcessurveysinChina'sexclusiveeconomiczone,thepaperdiscussestheapplicationoftheGIStechnologyinevaluatingthemarineenvironmentalquality,establishesthebasicconceptandtechnologicalprocessforevaluatingtheenvironmentalqualityofthehabitatsofmarinelivingresources,proposesthekeypointsfortheestablishmentoftherelevantevaluationattributesdatabasebyapplyingtheGIStechnologyandanalysesseveraltypicalevaluationmodelsandthedatainterpolationmethodforthemodelinGIS.ResultsshowthatthecombinationoftheGIStechnologywiththequantitativeevaluationmodelcanbeappliedtothefastandaccurateevaluationofthemarineenvironmentalquality.
简介:TheprobabilityoffractaldeterminationofcoastaltypesbasedonGISispreliminarilydiscussedwithChinaasanexample.Finally,somesignificantconclusionsaredrawn:(1)Thefractaldimensionofcoastlineofthebedrockcoastislargerthanthatoftheplaincoastonthesamescalemap;(2)Asfarasthebedrockcoastisconcerned,thelargerfractaldimensionofcoastlineofthebedrockcoastonthesamescalemapindicatesthatthebedrockcoastisprobablynottypical;(3)Asfarastheplaincoastisconcerned,thesmallerfractaldimensionofcoastlineoftheplaincoastonthesamescalemapindicatesthatitisprobablythesiltplaincoast;(4)Thedifferentsubstantialcompositionsaffectthefractaldimensionsofcoastlinesofdifferentcoastaltypes.Ingeneral,thecoastwhichliesinthenorthoftheHangzhouBayconsistsofsandmainly,itssurfaceisflat,anditisconnectedwiththecoastalplain,itslandformisbroadshoal,itstotalchangeiscomparativelyhomogenousinthetidaldynamicprocess,andthus,therelativelysmallerfractaldimensionofcoastlineresultsfromthis.Forthebedrockcoast,thereismorebedrock,thecoastlineiscomparativelysmoothandstraight,beingaffectedbythefaultsandoceandynamicprocess,whichresultinthelargerfractaldimension.
简介:Theestuaryandcoastisanareawherethelandandtheseainteractandaplaceinwhichhumanbeingsfrequentlymoveaboutsothatunderstandingandcontrollingthechangeanddevelopmentmodesofthecoastallandformplaysavitalpartinexploitingandprotectingcoastalresources.Amodelisthegeneralizationandabstractionofobjectivethings.Thispapersummarizesfourmethodsforthelandformdevelopmentofthetidalshoreandunderwaterdelta,mainlydiscussesthemodel'sstructuralelements,andpresentstheirspecificapplicationonthebasisoftheauthors'casestudy.Withtheapplicationoftheprofilemodel,thedynamicchangeofcoastallandformcanbeclearlyseenbycontrastingthedifferentprofilesofdifferentyears.Throughtheshrinking,expandingandtransformationoftheisobath,planemodelisusedtostudythemacro-changeoftheshoalandthecoastallandform.Speedmodelisanefficientmeanstoanalyzethetrendoferosionanddepositionandthelocalchangeinagreatareaofthesea.Statisticalsurveymodelisastaticanalysis,whichcanbeusedtoestablishtherelationshipbetweentheerosionanddepositionoftheshoalandthealtitudeandslopeofsurveyspot.
简介:海岛地区拥有丰富的旅游资源,但是生态环境相对脆弱,对海岛旅游地进行生态安全评价,有助于优化旅游发展和生态环境管理。以“压力—状态—响应”(PSR)模型为基础,建立了海岛旅游地生态安全评价指标体系,并使用综合指数法和熵权法分析2015年浙江省和福建省的10个县域和市域海岛旅游地的生态安全水平。实证结果表明:从现状评价看,各海岛旅游地的生态安全水平总体较低,浙江省的生态安全水平总体上高于福建省,其中舟山市的生态安全水平最高;从影响因子看,各海岛县的环境压力较大,经济状态较好,其次是环境状态和社会状态,环境响应较好;海岛旅游地生态安全状态与海岛面积、海岛面积占地域面积比重没有显著的相关关系。