杭州湾北岸上海段水域景观生态格局变化遥感研究

水域景观生态遥感对水域时空演变过程和趋势研究具有重要意义.本文基于Landsat系列卫星数据,利用归一化水体指数(Normalized Difference Water Index,NDWI)、归一化植被指数(Normal-ized Difference Vegetation Index,NDVI)和近红外反射率相结合...     

黄河口治理探讨

文中分析了目前黄河口道存在的问题,提出几点治理建议。认为含沙量增加、河槽萎缩、高槽河段及黄河断流是目前河口面临的主要问题,进行河道疏滩工程、利用ＤＢＳＬ（高含沙水层）层是河口治理的关键。     

GPS技术在杭嘉湖平原地面沉降监测中的应用研究

一、引言浙江省杭嘉湖平原位于长江三角洲南翼,西起莫干山东麓,北部、东北部分别与江苏、上海接壤,南濒钱塘江河口和杭州湾,总面积约6490km~2。该区水网密布,地势低平,仅在嘉兴、海宁、澉浦、乍浦等地及西部山前地带有零星残丘分布,海拔在100 m左右；平原区地面高程在2～4m,环太湖周围,地势低洼,高程仅1～2m,长期以来内涝严重。     

新物种再次“亮相”

全球海洋生物普查（C0ML）又取得了新进展，许多新物种纷纷“亮相”。其中一种龙虾的外貌十分独特：它的一只螯生长得非常夸张，其作用可能是与“敌人”发生冲突时自我保护。还有一种生活在美国阿拉斯加州阿留申群岛附近的褐藻Aureophyous aleutious，它是人类首次在靠近海岸的浅水水域发现的褐藻。     

用冷热休克诱导三倍体近江牡蛎

在近江牡蛎(Ostrea rivularis Gould)卵子授精后25分钟,分别用高温(35℃)和低温(10℃)持续处理20分钟,其胚胎发育初期的三倍体诱导率分别达到64％和69％。在这个高温点和低温点以外随着处理温度的升高或降低,三倍体诱导率均迅速减小。     

中国北部黄海近岸水体周丛硅藻的群落群集动态特征的研究

The colonization features of periphytic diatoms were studied in coastal waters of the Yellow Sea, northern China from May to June 2010, using glass slides as an artificial substratum. Samples were collected at a time interval of 1, 3, 7, 10, 14, 21 and 28 d from two depths of 1 and 3 m. The dynamics of diatom colonization process had a similar pattern in community structure and fitted the logistic model in growth curve at both depths. The maximum abundance and the time for reaching 50% maximum abundance （10 d） showed no significant differences （P〉0.05） between two depths 1 and 3 m. Although the diatom communities repre- sented similar taxonomic composition, they differed in the temporal pattern of structural parameters and in succession dynamics of dominant species between the two layers. The species richness showed significantly higher values during the colonization period more than 14 d, while the species diversity and evenness rep- resented a higher variability with significantly different values （P〈0.05） at a depth of 1 m than at a deeper layer. The results suggest that the diatom colonization follows the logistic model growth curve and differs in colonization features between different depths in the coastal waters, and that the sampling strategy at i m is more effective to detect the ecological features for bioassessment in marine ecosystems.     

潮汐河口水库中水力充填堤坝结构的渗控关键技术研究

随着近些年水力充填堤坝结构在潮汐河口水库中的应用和发展,渗流控制技术也随之不断完善。本文以上海青草沙水库工程中的北堤工程为例,论述了水力充填堤坝应用在潮汐河口水库中,其渗流控制技术研究分析过程,为类似工程的设计和研究提供了经验和参考。     

Imagestation OrthoPro正射影像匀光实践

简述了Imagestation OrthoPro匀光原理,结合其原理分析了正射影像匀光过程中,大面积水域、屋顶等产生明显色差的原因,并用实验证明相关的改正方法,即适当调整kernel size或darken maximun参数项值,可有效避免水域等大面积亮区匀光后产生明显色差。