宝鸡古土壤层S7和黄土层L8的天然剩磁锁定深度初探

详细的古地磁及岩石磁学研究表明磁铁矿和赤铁矿是宝鸡古土壤层S7和黄土层L8的特征剩磁的主要载磁矿物,在稳定的正反极性期间,这两种磁性矿物携带的剩磁方向完全一致.然而,在地磁漂移事件或者松山-布容(M-B)极性转换的过程中,这两种载磁矿物有时携带的剩磁方向不同.高分辨率的磁性地层结果证实宝鸡古土壤层S7和黄土层L8能记录300～500年的短期地球磁场极性倒转事件.经与日本大阪湾高分辨率的海洋沉积物中记录的同期短期极性倒转事件相比,估算宝鸡剖面土壤层S7和黄土层L8的天然剩磁锁定深度小于5～8 cm.     

Stokoe扭转剪切／共振柱仪性能及试验

本文简介了Stokoe扭剪/共振拄仪的结构、性能、原理、方法及通过各种试验方法所获得的部份成果。     

Information standardization for typical toxic and harmful algae in China’s coastal waters—a case study of Karenia mikimotoi

Journal of Oceanology and Limnology - To assist the researches of toxic and harmful algae and provide government workers with judgment basis for decision-making related events, we established a...     

山西省非物质文化遗产资源旅游利用潜力评价

以山西省11个地级市市区和97个县级地区为评价单元,基于昂普理论,从区域非物质文化遗产资源富集程度、非物质文化遗产与空间载体综合景观、投资环境3个方面建立区域非物质文化遗产资源旅游利用潜力评价模型,以层次分析法和专家打分法确定权重,并以ArcGIS 10.0叠加分析将单项测评结果综合为总评价值.结果表明:非物质文化遗产旅游化利用必须与有形的物质景观结合;手工艺、民俗和表演类等非物质文化遗产旅游利用的重要性远高于其他类;在微观层面,山西省非物质文化遗产旅游潜力较高的地区仅有1个市区、5个县,等级列前5位的地区只占22.2%;在区域层面,中部和南部非物质文化遗产旅游潜力远高于北部地区,且上党、晋商、河东文化区和省边界附近的传统聚落集中区非物质文化遗产旅游潜力突出.     

Tidal Asymmetry Changes in a Shallow Mud Estuary by a Restoration Project

The tidal asymmetry-induced siltation below tidal barriers is a worldwide problem that restricts regional socio-economic and environmental development. The hydrodynamic processes of the small mud estuary also feature a high uncertainty after estuary restoration measures. In this study, a hydrodynamic model based on the MIKE21 is used to quantify the responses of tidal asymmetry to a two-phase restoration project in Shuanglong Estuary, Bohai Bay, China. According to the numerical modeling results, the tidal flat removal in the upper estuary(first-phase restoration) induces the flood asymmetry switching to the ebb asymmetry in unrestored reach but enhances flood asymmetry in widening restored reach. Although the tidal asymmetry reverts to flood-dominated pattern after full restoration over the estuary, the imbalance between flood and ebb velocities is relieved. A possible net sediment transport pattern based on a comparison of dominant asymmetric current and actual sediment transport period shows net sediments in the upper estuary and inlet transport seaward and landward, respectively, in the first-phase restoration, whereas landward net sediment transport occurs in the whole estuary under the second-phase restoration scenario. Given these results, we assume that a switch from the flood-dominated estuary to ebb-dominated estuary can be caused by redesigning the cross-sectional profile. The quantitative comparison of Lagrangian residual currents also implies that a channel–shoal structure rather than a flat bathymetry can promote the mass transport. Therefore, reshaping the channel–tidal flat system in restoration projects can prevent the sedimentation of the estuary and improve the water environment.     

西宁药水滩地热田水化学特征及热水起源初探

西宁药水滩地热田热水的出露温度为18.1～40℃,TDS含量为1041～1707mg/L;冷泉水出露温度为3.5～6.5℃,TDS含量为210～403mg/L。水化学类型全部为HCO3型水,表明地下水经过相对浅的循环溢出地表。但热水比冷泉水有相对高的B表明热水比冷水有相对深的循环,样品的水化学特征是大气水与岩石相互作用处于早期的典型表现。SiO2地质温度计估算的热储温度为44～66℃。D和18O的测试结果表明:热田的水源于大气降水补给。氚含量和14C定年结果表明:热泉水的年龄为47.605±2.86ka,而冷泉水均来自1950年以后的大气降水补给。     

“十三五”期间山东省海参养殖产量预测与发展前瞻

文章利用H-P滤波法分析了山东省海参养殖资源的开发历程,并建立多变量灰色模型MGM(1,n)预测了山东省"十三五期间"的海参养殖产量。预测结果表明,山东省的海参养殖业在"十三五"期间将整体转向生产萎缩阶段,全省海参养殖业发展面临严峻挑战。为了确保山东省海参养殖业的持续高效发展,未来实践中应切实保障海参养殖空间,科学规划海参养殖空间布局,提升海参养殖科技支撑能力,推广生态健康型海参养殖模式,加强海参养殖技能培训和技术推广,同时做大做强海参消费市场,加强海参养殖业行政执法能力建设,并建立健全海参养殖业保险机制。