闽江河口咸淡水混合过程中营养盐含量的变化特征

为研究闽江水体营养盐等物质的输运作用,于2009年11月(秋季),分3个航段(北支、南支及闽江河口区)同步对闽江下游及其河口区表、底层水的盐度、营养盐、悬浮物含量等进行观测,并在北支流、南支流交汇处的19站(罗星塔附近)进行了一个潮周期的连续观测.调查期间闽江表层水体中无机氮含量变化范围在0.640～3.873 mg/dm3之间,平均值为1.789 mg/dm3;活性磷酸盐含量变化范围在0.011～0.059 mg/dm3之间,平均值为0.027 mg/dm3;可溶性硅酸盐含量变化范围在0.82～7.10 mg/dm3之间,平均值为3.77 mg/dm3;总氮含量变化范围在0.67～3.91 mg/dm3之间,平均值为2.39 mg/dm3;总磷含量变化范围在0.027～0.289 mg/dm3之间,平均值为0.087mg/dm3.水体各营养盐含量的平面分布呈闽江北支流的含量均高于南支流,其高值区受陆源输入的影响集中出现在21～23号站区间.受城市污水影响的北支流水体与南支流水体交汇后,近海河段水体营养盐含量迅速降低.在一个潮周期内,涨潮时,随着外海水占比的提高,营养盐含量呈现随着盐度升高而逐步降低的趋势;在退潮时,陆源冲淡水的作用逐渐加强,营养盐在河口表现为随着盐度降低而逐步增高的趋势.闽江河口水体活性磷酸盐含量与盐度没有显著的相关性,为非保守要素;而无机氮、可溶性硅酸盐和总氮整体表现为保守要素.同时,发现在闽江河口盐楔端浊度最大值的"滤器"滞留区,总氮含量受其富集的影响在底层产生一个高值区.     

Cyclic performance of large‐scale corroded reinforced concrete beams

Nine large‐scale beam specimens were constructed. Of which, one was used as the control, whereas the other eight ones were divided into four sets. Each set had two specimens and was subjected to accelerated corrosion using an imposed current for the same time interval. Following the corrosion, a specimen in each set was tested using cyclic loading to examine the seismic performance, whereas the other one was demolished to examine the extent of corrosion. Cyclic loading results indicated that with an increasing corrosion level, the ultimate drift, ductility, plastic rotation capacity, and energy dissipation of the beams initially increased and later decreased. The failure mode switched from flexural failure, largely owing to buckling of the longitudinal reinforcement to flexural‐shear failure, which is mainly caused by fracturing of the transverse reinforcement. Corrosion increased shear deformation and the spread of plasticity of the plastic hinge region. The residual flexural strength, as estimated by an empirical equation based on the maximum pit depth in the longitudinal reinforcement, closely corresponds to experimental values. Furthermore, the residual shear strength estimated based on the minimum reduced cross‐sectional area of transverse reinforcement correlates better with the experimental observations than that based on the weight loss. Copyright © 2011 John Wiley & Sons, Ltd.     

Risk assessment of secondary geological disasters induced by the Yushu earthquake

The Yushu Ms 7.1 earthquake occurred on April 14,2010 in Qinghai Province,China.It induced a mass of secondary geological disasters,such as collapses,landslides,and debris flows.Risk assessment maps are important for geological disaster prevention and mitigation,and also can serve as a guide for post-earthquake reconstruction.Firstly,a hazard assessment index system of secondary geological disasters in the earthquake region was built in this paper,which was based on detailed analysis of environmental and triggering factors closely related to geological disasters in the study area.GIS technology was utilized to extract and analyze the assessment index.Hazard assessment maps of secondary geological disasters were obtained by spatial modeling and overlaying analysis.Secondly,an analysis of the vulnerability of hazard bearing bodies in the area was conducted,important information,such as, population density,percentage of arable land, industrial and agricultural outputs per unit area were regarded as assessment indices to evaluate socioeconomic vulnerability.Thirdly,the risk level of secondary geological disasters of the area was obtained by the formula:Risk=Hazard×Vulnerability. Risk assessment maps were categorized into four levels,including"low","moderate","high"and"very high".These results show that some urban areas are at very high risk,including Jiegu,Chengwen,Xiaxiula and Sahuteng towns.This research can provide some references and suggestions to improve decisionmaking support for emergency relief and post- earthquake reconstruction in the study area.     

基于城镇地籍数据库建立前的数据质量检查

采用MapSUV测绘和MapGIS平台建库的数据,主要有图形数据、属性数据和影像数据。在建库前根据全国和山东省第二次土地调查城镇建库标准,对每一类数据进行分析,针对其特点制定出检查的内容、方法和标准。经过检查的数据可以保证建立高质量的数据库。     

山东省地下水监测优化调整方案探析

山东省地下水监测工作历史悠久,随着时间的推移,监测点破损严重,现有监测网络已经不能满足全省地质环境工作的需求。针对地下水监测工作现状,剖析了现有监测网络存在的主要问题,并结合下一步需求,有针对性的进行了系统分析,提出了优化调整方案,以供全省地质环境监测工作方案调整借鉴。     

福建省旅游台胞客流时空特性研究

尝试从宏观和微观、时间和空间的分析视角,采用旅游地理、旅游市场分析、数理统计及实证分析等研究原理及方法,对入闽旅游台胞时空动态的区域差异（包括旅游空间感知差异）进行深入系统分析．研究认为自1979年以来,入闽台胞旅游市场发展大致经历了4个时期;从历年旅游台胞客流量及其年际、年内变化看,都表现出一定的地区差异,其中厦门接待的旅游台胞客流量长期居全省首位,而三明接待台胞客流量最少;福州旅游台胞客流量的年际变化最小,而龙岩和宁德年际变化最大;其次,一般在每年的5月和9月形成入闽旅游台胞客流的高峰期,2月和11月为客流的低峰期;三明和宁德的R值（季节集中指数）最高,而厦门R值最低．最后,从旅游空间感知偏好与实际接待客流量交叉分析看,除了莆田马祖文化朝圣游、三明桃源洞／金湖绿色生态游以外,其余旅游空间感知偏好与实际旅游空间体验基本相符,厦门、福州、泉州、南平等是台胞旅游感知偏好较高的城市,也是台胞实际参与旅游体验最多的地区．     

福建省旅游台胞客流时空特性研究

尝试从宏观和微观、时间和空间的分析视角,采用旅游地理、旅游市场分析、数理统计及实证分析等研究原理及方法,对入闽旅游台胞时空动态的区域差异(包括旅游空间感知差异)进行深入系统分析.研究认为自1979年以来,入闽台胞旅游市场发展大致经历了4个时期;从历年旅游台胞客流量及其年际、年内变化看,都表现出一定的地区差异,其中厦门接待的旅游台胞客流量长期居全省首位,而三明接待台胞客流量最少;福州旅游台胞客流量的年际变化最小,而龙岩和宁德年际变化最大;其次,一般在每年的5月和9月形成入闽旅游台胞客流的高峰期,2月和11月为客流的低峰期;三明和宁德的R值(季节集中指数)最高,而厦门R值最低.最后,从旅游空间感知偏好与实际接待客流量交叉分析看,除了莆田马祖文化朝圣游、三明桃源洞/金湖绿色生态游以外,其余旅游空间感知偏好与实际旅游空间体验基本相符,厦门、福州、泉州、南平等是台胞旅游感知偏好较高的城市,也是台胞实际参与旅游体验最多的地区.     

江苏宜兴骆驼墩遗址地层7500-5400BC的海侵事件记录

Based on archaeological excavations, 217 samples were collected from the Luotuodun Site. Of them 63 samples from the section plane of the site layer were used for identification analysis of foraminifera, plant debris and seed fossils, and four samples were used for ¹⁴C dating and relevant analysis. Through many kinds of experiments, we have drawn some conclusions. Firstly, benthic foraminifera, such as Ammonia compressiuscula and Ammonia cff. sobrina, are found in the 10th layer, indicating that between 7500 and 5400 BC, i.e. before the emergence of the Majiabang Culture, Luotuodun Site and its nearby regions had ever experienced a marine transgression event. Secondly, we have found 450 plant fossils in this site, such as Polygonum sp., Scripus sp., Najas sp., Physalis sp., which indicated lacustrine or swamp environment.     

浙江江郎山丹霞地貌发育的年代与成因

江郎山位于华南褶皱系、江山-绍兴深断裂和保安-峡口-张村断裂带之间.白垩纪早期这两大断裂的拉张断陷导致峡口盆地的形成,随之主要有下白垩统永康群馆头组(K1g)、朝川组(K1c)和方岩组(K1f)在盆地中的沉积.白垩纪晚期上述两大断裂发生强烈挤压活动,峡口盆地逐渐隆升.新生代以来,峡口盆地在构造抬升中,产生大量张断裂和节理,加速了对岩体的切割,以及岩体被切割后的崩塌,导致了丹霞地貌的发育.江郎山丹霞地貌申报世界自然遗产的主要依据是其特有的壮观而独特的老年期孤峰-巷谷以及生动而逼真的象形石丹霞地貌特征、独特的地台活化现象与重要的岩石学科学研究意义以及该区特有的重要事件地层学和古生物学研究的科学意义.本文根据对江郎山亚峰垂直贯穿于丹霞地貌岩层永康群中辉绿岩脉标本K-Ar法的测年,揭示了当地峡口红层盆地抬升的时代为晚白垩世77.89±2.6Ma BP(K2),这也是我国目前丹霞地貌研究中所测得的可靠年代学数据.