怀4井汞量异常与地震的关系

首先介绍了怀来４井地质构造情况,然后根据怀来４井１９８９－１９９８年水汞观测资料,分析了４次中强地震前汞量异常与地震的关系。结果显示,怀来４井汞量异常与地震前的地震活动异常有较好的对应关系。     

安徽淮北三铺地区镁夕卡岩金（铜、铁）矿床生成地质环境、分带和流体演化

世界上的含金夕卡岩大多属钙夕卡岩型,镁夕卡岩金矿床十分稀少。本文介绍我国安徽北部三铺地区镁夕卡岩金（铜、铁）矿床的地质地球化学特征。该区含金（铜、铁）镁夕卡岩主要产于台地断拗区燕山期石英二长闪长玢岩与中上寒武统白云质大理岩外接触带。岩体内接触带发育钙夕卡岩和钾长石化,局部有辉钼矿化产出。金矿化与铜的硫化物密切共生,属于镁夕卡岩的退化热液交代作用产物。金属矿化分带序列自蚀变石英二长闪长玢岩到镁夕卡岩     

温度、日粮水平和体重对黑鲷幼鱼排泄能的影响

动物代谢的主要能源物质为脂肪、碳水化合物和蛋白质,前两者在体内可以完全氧化而生成二氧化碳和水,而蛋白质的代谢终产物是氨、尿素和其它含氮化合物,它们是含能物质。鱼类蛋白质的含氮代谢物质主要通过鳃排出,少量通过尿液排出(Beamish et al.,1984),这种排泄物的能量损失也称为非粪便失能。 鱼类非粪便失能的测定方法主要是直接测定鱼的氨及尿素排泄量,然后通过氨及尿素的含能量来计算;另一种方法是通过氮收支方程来间接估计排泄物的能量损失(Gerking,1955;Savitz,1971; Savitz et al.,1977;Lwata,1970;Porter et al.,1987),Braaten(1979),Bower等(1980),Cameron等(1983), Brafield(1985)和Knights(1985)对鱼类排泄量的各种测定方法进行了介绍和综述。本研究是应用氮收支方法来间接估算黑鲷的排泄能损失。这对于探讨鱼类对蛋白质的利用效率及代谢产物对养殖水环境的影响都具有一定的指导意义。     

A dynamic 2DH flocculation model for coastal domains

Ocean Dynamics - A dynamic two-dimensional depth-averaged (2DH) parameterization for flocculation of cohesive sediments is proposed based on the kinetic model by Winterwerp (J Hydraul Res...     

美国罗德河流域地下水中铝形成动力学

In the Rhode River estuarine/watershed area, increased acidity of precipitation from atmospheric acidic deposition has deleterious effects on the freshwater ecosystems. One of the characteristics of an acidic watershed is the mobilization of aluminum from soils to aquatic environment. Increased concentrations of aluminum in surface waters are toxic to living organisms. Detection of long-term changes of acidity and elevated Al concentrations in surface and soil waters is a central issue. In this present paper, the dynamics ofAl speciation in the shallow ground waters from Rhode River watershed 110 (la) were investigated. This research provides a unique, regional analysis of important controls on the transport of Al speciation through the rural watershed of the Chesapeake Bay.     

Numerical modeling of storm surges in the coast of Mozambique: the cases of tropical cyclones Bonita (1996) and Lisette (1997)

The coast of Mozambique is often affected by storms, particularly tropical cyclones during summer or sometimes midlatitude systems in the southern part. Storm surges combined with high freshwater discharge can drive huge coastal floods, affecting both urban and rural areas. To improve the knowledge about the impact of storm surges in the coast of Mozambique, this study presents the first attempt to model this phenomenon through the implementation of the Princeton Ocean Model (POM) in the Southwestern Indian Ocean domain (SWIO; 2–32°S, 28–85°E) using a regular grid with 1/6° of spatial resolution and 36 sigma levels. The simulation was performed for the period 1979–2010, and the most interesting events of surges were related to tropical cyclones Bonita (1996) and Lisette (1997) that occurred in the Mozambique Channel. The results showed that the model represented well the amplitude and phase of principal lunar and solar tidal constituents, as well as it captured the spatial pattern and magnitudes of SST with slight positive bias in summer and negative bias in winter months. In terms of SSH, the model underestimated the presence of mesoscale eddies, mainly in the Mozambique Channel. Our results also showed that the atmospheric sea level pressure had a significant contribution to storm heights during the landfall of the tropical cyclones Bonita (1996) and Lisette (1997) in the coast of Mozambique contributing with about 20 and 16% of the total surge height for each case, respectively, surpassing the contribution of the tide-surge nonlinear interactions by a factor of 2.     

典型富营养化城市河流——浙江温瑞塘河的浮游植物群落类型与季节变化

为评估温瑞塘河水环境状况及水华风险,于2015年每月15日7:00-18:00对其下游滞流河段进行高频监测分析,考察了水体叶绿素a浓度、浮游植物群落类型和光合活性等的季节变化及日变化情况,并分析了其与温度、营养盐等环境因子的关系.结果表明:温瑞塘河表层水体中的叶绿素a浓度表现为春季(3-5月)夏季(6-8月)秋季(9-11月)冬季(12-2月),分别为39.98、37.62、21.59和10.74μg/L;4个季节的平均水温则是夏季秋季春季冬季,分别为30.91、25.34、20.72和13.80℃.全年总氮浓度为5.33±0.81~9.40±1.25 mg/L,总磷浓度为0.32±0.18~0.95±0.25mg/L,营养程度属于超富营养.温瑞塘河的浮游植物群落类型为硅藻-绿藻型,全年以绿藻和硅藻种群为主,蓝藻种群只在春末夏初出现,并且所占比例很小.绿藻种群在夏季占绝对优势,而硅藻种群在冬季占优势.绿藻种群的相对丰度与水温呈正相关,而硅藻种群的相对丰度与水温呈负相关.水体的叶绿素a浓度与水温呈正相关,而与总氮、总磷浓度没有相关性.叶绿素a在不同季节呈现出不同的日变化模式,而浮游植物的有效光合量子产率在四季均呈现类似的日变化模式:都是先降后升,与晴天时的日照强度变化趋势相反.绿藻的有效光合量子产率高于硅藻,且除春季外皆存在显著差异.以上结果表明温瑞塘河具备发生各类水华的营养条件,但是由于蓝藻在全年所占的比例都很低,因此发生蓝藻水华的可能性很小;同时由于日照变化会对表层水体中叶绿素a浓度及浮游植物生理活动产生影响,因此在对小型湖泊或者水流滞缓的河道进行浮游植物群落结构调查时还应考虑时间和天气因素.     

地闪对崇明地震台地球物理观测的干扰

通过对比崇明地区地闪及崇明地震台地球物理观测资料,发现受地闪引起的电磁场变化的直接作用或对仪器元件的间接作用,地磁、地电、电磁扰动和水位观测干扰比例较高,干扰幅度与地闪距离及形成的电流强度有关。具体干扰形态如下：①对电磁扰动干扰表现为单向突跳和测值的整体抬升;②对地磁测项干扰表现为正负方向的单点突跳;③对大地电场干扰表现为大幅震荡;④对水位观测干扰表现为大幅突跳。     

移动电子地图中伪3D可视化设计

定义了移动电子地图中伪3D可视化概念,提出伪3D可视化模型,并设计了快速的三维投影变换算法。进行了移动电子地图的伪3D可视化实验设计,并给出了可视化性能测试结果。     

Typhoon frequency sequence reconstruction and characteristics analysis in the Southeast Coastal Area over China during the Ming and Qing dynasties

Natural Hazards - This study involved the systematic collation of historical data from local records, government records, etc., as well as disaster data compiled by contemporary researchers....