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《海洋学研究》2017,(3)
根据遥感水深反演原理,利用海南岛龙湾港的World View-2多光谱卫星数据和海图水深资料,通过对水深进行0~2,2~5,5~10,10~15和15~20 m的分区处理、潮汐改正和海图水深数据与相应图像波段反射率值的相关性分析及回归分析,建立了浅海水深线性回归反演模型,开展了浅海水深的实际计算与精度分析。结果表明:对不同水深范围分别建立线性回归模型反演的水深精度要高于未分区建立的模型;分区模型中,多波段模型在0~5 m的反演精度最高,而双波段比值模型在5~20 m的反演精度最高,但是反演水深在最浅处的精度还有待提高。本文方法提取的水深与海图水深数据变化趋势基本相似,可以满足海洋科学研究对大范围浅水水下地形探测的要求。 相似文献
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基于GeoEye-1和WorldView-2遥感数据的浅海水深反演比较研究 总被引：1，自引：1，他引：0
浅海区水深的精确反演对于海洋空间管理和生态环境保护至关重要。选取南海西沙群岛的羚羊礁海域为研究区,基于GeoEye-1和WorldView-2高分辨率多光谱遥感数据和实测水深数据,分别建立了单波段模型、多波段模型和波段比值模型。结果显示,由绿波段参与建立的水深反演模型相关性普遍较高,同时利用4个波段组合建立的多波段模型精度最高,相关系数分别达到了0.870和0.853。基于该模型的反演结果对GeoEye-1和WorldView-2遥感数据在不同水深范围内的反演精度进行比较,结果表明,两种数据在不同水深范围内的反演误差变化趋势一致,平均相对误差最大值均出现在0～5 m,而最小值均出现在20～25 m。总体而言,WorldView-2影像反演水深的精度高于GeoEye-1影像的反演精度。研究对于热带浅海区的水深反演工作具有一定的参考意义。 相似文献
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大气校正是水体定量遥感的基础与前提。本文从大气校正模型、大气校正模型参数、水体组分差异以及水深反演波段组合方式4个维度探讨大气校正模型对水深反演的影响。研究采用6S、FLAASH、ACOLITE与QUAC 4种大气校正模型,选取大陆型、海洋型与城市型气溶胶模式,以瓦胡岛西北侧与谢米亚岛周边浅水作为清洁水体研究区,以辽东浅滩与槟城海峡作为浑浊水体研究区,基于Landsat-8多光谱影像开展大气校正,并采用8种波段组合方式进行水深遥感反演。研究结果表明:（1）4种大气校正模型均可在一定程度上削弱大气对水体信号的影响;因参数选取以及研究区水体组分的不同,不同模型的校正结果存在一定差异;两类水体反射率峰值分别出现在蓝波段与绿波段;（2）6S大气校正模型鲁棒性较强,该模型因研究区水体组分发生变化导致对应的水深反演结果与其余模型相比波动较小;FLAASH模型在海洋型和城市型两种气溶胶模式水深反演结果在浑浊水体存在较为明显的差异,辽东浅滩浅水区平均相对误差相差7.9%;ACOLITE模型受水体类型影响显著且对浑浊水体具有优越性与稳定性,平均相对误差较FLAASH降低5.6%;（3）多波段水深反演精度普遍优于单波段,但反演精度与波段数目之间无显著的相关性;水深反演波段组合方式对不同研究区敏感性不同,清洁水体三波段模型的反演精度较好,浑浊水体中四波段模型的反演精度最优,平均相对误差较三波段模型降低达5.6%。 相似文献
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珠江口水深遥感反演研究 总被引：1，自引：0，他引：1
建立了珠江口2个试验区遥感测深的多种统计相关模型,并选取相关性最好的模型进行水深反演和结果分析,探讨了不同悬沙浓度情况下遥感测深的可能性和实用性。结果表明,对于悬浮泥沙浓度大的试验区1,实测水深值和遥感各波段DN值的相关性<0.5,实际反演水深的能力较差,加入了泥沙因子的统计相关模型相关性有较大提高,但水深反演精度仍不高,达不到实际应用的精度;而悬浮泥沙浓度较小的试验区2,实测水深值和遥感各波段DN值的相关性基本大于0.7,但加入泥沙因子后水深值和遥感波段的相关系数并没有提高,以B2为反演因子的指数模型反演精度最高,5～10m水深段的反演效果最好,平均相对误差为22.5%、平均绝对误差为1.56m,模型总体平均相对误差为31.9%、总体平均绝对误差为1.92m,反演结果较好地反映了试验区2的水深情况。从所建模型来看,非线性模型的反演效果均好于相应的线性模型,多因子模型好于单因子模型。 相似文献
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《海洋技术学报》2023,(4)
水深是重要的海洋要素，水深遥感反演是获取浅水水深的重要手段。当前水深遥感反
演应用以国外卫星数据为主，国产卫星数据的研究和应用较少。本文针对国产高分六号卫星
（GF-6） 数据，以三亚南山港为研究区域，分别建立单波段回归模型、双波段比值模型、多波段
回归模型，进行多光谱影像的水深反演能力研究，并与国外主流哨兵2 号卫星（Sentinel-2） 数
据进行实验比较。实验结果表明：GF-6 遥感影像具有较好的浅水水深反演能力和一定的反演精度，各波段水深探测能力依次为：绿波段跃蓝波段跃红波段跃近红外波段，反演方法效果依次为：多波段模型跃双波段模型跃单波段模型。相较于Sentinel-2 数据，GF-6 数据水深反演精度与其一致，这表明GF-6 影像具备替代国外遥感数据进行水深反演的能力和大规模应用的潜力。本文针对GF-6 影像水深反演能力的研究方法和分析，结果将为国产高分系列卫星数据的水深反演研究和应用提供有益的参考。 相似文献
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利用WorldView-2高分辨率卫星影像,以南海北岛附近海域为研究区,研究了两种水深反演模型——对数变换模型(Stumpf 2003)和双波段线性回归模型(Lyzenga 1985)。分析了不同底质情况下水深与各波段的相关性,并利用L-M(Levenberg-Marquardt)算法求解模型参数,然后对两种模型反演的水深结果的精度进行了对比分析。对于珊瑚底质,Lyzenga 1985模型水深反演的决定系数和均方根误差分别为0.902和1.651,均优于Stumpf 2003模型(0.882,6.421);对于砂质底质,Lyzenga 1985模型水深反演的决定系数和均方根误差分别为0.897和0.529,均优于Stumpf 2003模型(0.779,0.723)。可见,在水体清澈的珊瑚底质和砂质底质区域,Lyzenga 1985模型的水深反演精度均优于Stumpf 2003模型,Lyzenga 1985模型普适性更强,能够呈现出较为稳定的反演效果。 相似文献
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基于SPOT-6遥感影像的近海水深反演 总被引：1，自引：0，他引：1
《海洋学研究》2016,(3)
水深反演对于浅海地形调查、海岸带保护和开发具有重要的意义。本文选取南海东锣岛海域为研究区,采用SPOT-6 6m高分辨率数据,基于SPOT-6多光谱数据和水深实测值分别建立蓝-绿、蓝-红等6个波段比值模型。结果显示,绿-红波段的比值模型精度最高,R2值达到0.706 4,这对于反演热带海洋地区水深具有一定借鉴意义。基于该模型的反演结果对不同水深范围内的平均相对误差进行比较,结果表明:0~5m水深范围反演误差较高,主要由于该范围水体情况较复杂,5~10m水深范围内平均相对误差最小为13.62%,而随着水深的增加,反演的误差增大,分析误差的主要来源是海水中的悬浮颗粒物、黄色物质、叶绿素质量浓度等方面的影响。 相似文献
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Christian Ferrarin Georg Umgiesser Andrea Cucco Tai-Wen Hsu Aron Roland Carl L. Amos 《Coastal Engineering》2008
Recognising the importance of understanding sediment dynamics to evaluate the status of a coastal lagoon environment, this work has been focused on the investigation of the hydrodynamic and sediment transport processes occurring in such basins. In order to describe the lagoon system, a modelling approach combining hydrodynamics, waves and sediment dynamics has been developed. The framework of the numerical model consists of a finite element hydrodynamic model, a third generation finite element spectral wave model and a sediment transport and morphodynamic model for both cohesive and non-cohesive sediments. The model adopts the finite element technique for spatial integration, which has the advantage to describe more accurately complicated bathymetry and irregular boundaries for shallow water areas. The developed model has been applied to test cases and to a very shallow tidal lagoon, the Venice Lagoon, Italy. Numerical results show good agreement with water level, waves and turbidity measurements collected in several monitoring stations inside the Lagoon of Venice. Such a model represents an indispensable tool in analysing coastal problems and assessing morphological impacts of human interference. 相似文献
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《Estuarine, Coastal and Shelf Science》2006,66(1-2):67-83
The present study investigates the different uses and the functional roles of shallow habitats for fish fauna in the Venice Lagoon, by applying the functional guilds approach. Temporal (seasons) and spatial (location) changes within the lagoon show different habitat uses by fish assemblages, not influenced by local factors. Unvegetated mud habitats (salt marsh creeks and sub-tidal mud flats) and sparsely vegetated (seagrass) habitats show a common nursery role, especially for marine migrant fishes; but, contrary to other similar areas elsewhere shallow seagrass beds in the Venice Lagoon do not have a primary nursery role. This latter habitat has a more important role as a spawning ground for a resident, highly specialized component of the fish community. The habitat uses and their role to fish fauna illustrate the balance between predation risk and foraging profitability, as major factors structuring the fish assemblages. Spatial effects at a larger scale also highlight general characteristics of the fish assemblages in the Venice Lagoon. These indicate differences between the Northern sub-basin and the other two lagoon sub-basins, due to differences in the hydrodynamic regime, habitats distribution, and contributions from land and sea. 相似文献
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Hakan Alp 《Geo-Marine Letters》2014,34(5):447-455
A total of 42 km of high-resolution seismic reflection and bathymetric data were collected for the first time to document stratigraphic and structural features of the uppermost 5 m of the Holocene sedimentary infill of Küçükçekmece Lagoon along the Marmara Sea coast of Turkey. The lagoon gradually deepens from 1 m off the northern coast to a maximum of 20 m in the southern basin. Stratigraphically, the uppermost seismic unit is characterized by a generally parallel reflection configuration, indicating deposition under low-energy conditions. In the southern basin of the lagoon, the sub-bottom is locally characterized by frequency attenuated and chaotic reflections interpreted as gas-charged sediments. Structurally, the soft sediment of the first 5 m below the lagoon floor is locally deformed by active strike-slip fault zones, here named FZ1, FZ2, and FZ3. These fault zones are NW–SE oriented and follow the long axis of the lagoon, compatible with the geographic alignment of the lagoon, the onland drainage pattern, and the scarps of the surrounding terrain. Moreover, the fault zones in Küçükçekmece Lagoon are well correlated with active offshore faults mapped during previous studies. This suggests that the FZ1, FZ2, and FZ3 fault zones are not merely local fault systems deforming the Küçükçekmece Lagoon bottom, but that they may be part of a regional fault zone extending both north and southward to merge with the northern branch of the North Anatolian Fault Zone (NAFZ) in the Ç?narc?k Basin. This, however, needs to be confirmed by further structural and seismological studies around Küçükçekmece Lagoon in order to more firmly establish its link with the NAFZ in the Marmara Sea, and to highlight potential seismic risks for the densely populated Istanbul metropolitan area. 相似文献
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Hugues Blanchet Xavier de Montaudouin Pierre Chardy Guy Bachelet 《Estuarine, Coastal and Shelf Science》2005,64(4):561-576
Sediment stability in the shallow Venice Lagoon was investigated by means of numerical modelling. Results from a hydrodynamic model allowed for the determination of the wave climate and bottom effective parameters so that simulations with a Lagrangian model for suspended particulate matter could be performed. A spring–neap cycle in summer 1998 was chosen as integration period since data for calibration and verification were collected within the European project F-ECTS between summer 1998 and spring 1999. Deposition on shallow mud flats as well as short term erosion during a strong wind event were reproduced and mass balances for two areas computed. A relation of patterns of SPM in the water and in the sediment was found and can be ascribed to the displacement of material during storm events from shallow areas to the bottom of very small channels. Assuming about 10 to 14 storm events during the year comparable to the Bora event during the integration time, estimates for long-term trends of sediment loss on shallow flats by Day et al. [Day, J.W., Rybczyk, J., Scarton, F., Rismondo, A., Are, D., Cecconi, G., 1999. Soil accretionary dynamics, sea-level rise and the survival of wetlands in Venice Lagoon: a field and modelling approach. Estuarine, Coastal and Shelf Science 49, 607–628] are met by the simulation results. Evidently, long-term sediment evolution of the lagoon is therefore not dominated by the average (residual) processes that occur in the lagoon, but by the few peak events that happen randomly over the year. 相似文献
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泻湖是全新世海侵以来发育的以淤积为主的海岸地貌,其沉积地层蕴含了丰富的古环境演变信息.对朝阳港泻湖SO4钻孔岩芯样品作粒度、软体动物、孢粉和14C等项目的测试分析,将该孔地层自下而上划分成陆相、滨浅海相、泻湖相、泻湖-沼泽相等四层和Ⅰ,Ⅱ,Ⅲ,Ⅳ个孢粉组合带.基于对地层和孢粉组合特点的深入剖析,结果表明朝阳港泻湖自全新世海侵以来经历了海湾、沙坝-泻湖和泻湖-沼泽等3个环境演化阶段,同时存在明显的沉积环境和气候变化事件,包括8～7 ka B.P.海陆相之间的不整合沉积间断事件、7～6 ka B.P.的气候暖湿事件和5～4 ka B.P.的明显降温事件. 相似文献
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遥感测深技术是海岸、河口及其他水体水深测量的一种新方法,应用前景广阔。在海洋的近岸、河口处水体相对浑浊,利用可见光技术测深的精度依赖于建立合适的水深反演模型和考虑水体悬浮物质的影响。选择合适的水深反演因子和比较多种线性、非线性水深反演模型,通过对水体悬浮泥沙光谱特性的研究,建立了适于河口、近岸浅水浑浊水体并考虑悬沙浓度影响的水深反演模型。通过检验,由该模型反演的平均相对误差小于15%,在7~14 m的水深段反演效果更好,其平均相对误差小于8.5%。 相似文献
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Jürgen Alheit 《Estuarine, Coastal and Shelf Science》1983,17(5):547-554
Harrington Sound, Bermuda, is a shallow subtropical lagoon with carbonate sediments. The most important fishes in this lagoon, in terms of biomass, are grunts (Haemulon aurolineatum, H. flavolineatum, H. sciurus) and a sea-bream (Diplodus bermudensis). These undertake diel feeding migrations from the shallow rocky zone towards the deeper sand and mud zones. When feeding on zoobenthos they cannot avoid swallowing carbonate sediment particles. These sediment particles pass through the alimentary canal of the fishes and are deposited again, after digestion of the food, as faeces in the shallow zones. Thus, the fishes transport the sediment in an unusual direction, from the deep to the shallow zones, in effect against the force of gravity. By recording the fish stock densities, digestion rates, and calcium carbonate content of fish stomach and guts, it was possible to estimate the amount of sediment transported by the fishes. In Harrington Sound, this amounts annually to 4530 kg calcium carbonate, 40% of which is deposited in the very shallow areas. The pH-values measured in fish stomachs seem to be acidic enough for the dissolution of carbonate sediment particles when transported by fishes. 相似文献
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利用卫星多光谱数据反演浅海水深是水深测量的一种重要手段。已有水深反演方法是在研究区建立统一的数学参数的反演模型,未考虑由于海底底质和水质变化导致的空间非平稳性问题。本文使用地理加权回归模型(Geographically Weighted Regression, GWR)对回归参数在空间上进行估计,针对GWR模型的带宽对反演精度的影响,使用了交叉验证(Cross Validation,CV)的方法来确定最佳带宽,并以南海永兴岛和甘泉岛海域为实验区,基于WordiVew-2多光谱数据对使用GWR模型的可行性和精度进行了验证。实验结果表明:永兴岛研究区GWR模型精度较线性回归模型提高了36.05%,在0~5,5~10,10~15和15~20 m区间,精度分别提高了49.46%,39.97%,12.36%和49.68%;甘泉岛研究区GWR模型精度较线性回归模型提高了8.08%,在0~5,5~10,10~15和15~20 m区间,精度分别提高了12.05%,16.23%,4.49%和12.23%,表明GWR模型具有更好的水深反演效果。 相似文献
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南沙群岛珊瑚礁动力地貌特征 总被引：1，自引：0，他引：1
南沙群岛受季风、台风和波浪的影响，珊瑚礁体呈ＮＥ－ＳＷ向椭圆形态，西南礁坪宽于东北礁坪。位于不同波能带内的珊瑚礁体发育了与之相适应的动力地貌单元。礁前斜坡高波能带地形陡峭，向风坡礁脊一槽沟系发育。外礁坪消耗大量波能，广泛覆盖生物碎屑，珊瑚生长稀疏。内礁坪宽广平坦，珊瑚生长良好。外礁坪堆积许多大礁块，尤以东北礁坪为甚。在湖低波能带，通常东坡缓于百坡，湖盆一般浪静流缓，为生物碎屑堆积区。 相似文献
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七里海泻湖的形成与演变 总被引：2，自引：0，他引：2
七里海泻湖位于渤海湾的西北岸，是全新世晚期的一个半封闭泻湖。在其演变过程中至少经历过两次由泻湖──淡水湖──泻湖的过程。水体及湖体性质的变化决定于其是否与海连通及河流注入情况。近期，受人类经济活动及工程的影响，七里海泻湖生态系统遭到严重的破坏，并加速了泻湖的退化和消亡。 相似文献