Burst strain disturbance—A new test study on fracture precursor

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单舰航线水文气象保障特点和思考

文中总结单舰航线水文气象保障业务的特点、难点,并结合航线水文气象保障的现状提出一些个人的建设性建议。     

全球降水观测计划多卫星联合反演降水产品的极端降水监测潜力研究

基于全国自动站与CMORPH融合降水数据集,综合评估全球降水计划（GPM）下的IMERG与GSMaP的4套纯卫星降水数据,从极端降水指标、极端降水事件探测能力、对于不同历时的极端降水事件精度评估3个方面研究纯卫星降水产品监测极端降水的能力。依据极端降水的阈值将研究区分为3个区域进行研究,结果表明：（1）在RX1指标中,IMERG、GSMaP数据均在受季风影响的复杂地形区域呈现出明显的高估状态,在其余地区存在不同程度的低估现象;在R95pTOT指标中,卫星数据均表现较好,与地面参考数据具有较高的相关性。（2）在极端降水事件探测方面,4套纯卫星产品在东北地区的表现均优于其他区域;GSMaP表现优于IMERG数据,具有较低的误报率,但对极端降水的反演精度较低。（3）在不同历时的极端降水事件精度评估中,IMERG、GSMaP卫星降水产品在历时较长的极端降水事件中的表现较好,具有更高的精度;对于极端日降水事件,卫星降水产品在高雨强下的误差显著性十分明显,远远高于复杂地形对卫星降水反演精度的影响,导致卫星降水在复杂地形区域（Ⅲ区）的表现优于其他区域。总体上,IMERG产品在研究区对极端降水的监测能力优于GSMaP产品,其中又以IMERG_Late表现最佳;4套卫星降水产品均能表现出研究区的极端降水区域特征,但在研究区大部分区域呈现出低估状态,卫星降水产品对于雨强的误差订正仍是未来极端降水反演的重点与难点之一。     

攀枝花市三区地质灾害分布特征及防治

简要论述了攀枝花市三区自然地理、地形地貌、地层岩性、地质构造、地震及新构造运动、岩土体工程地质特征及分布的基础上,统计了攀枝花市三区地质灾害情况,分析了三区地质灾害类型及分布特征,提出了相应的防治原则与对策措施。     

Analysis on the law of occurrence of shallow geothermal energy in Zhoukou City of Henan Province,China

In this paper, through data collection and field investigation, the development and utilization status of shallow geothermal energy in Zhoukou urban area was discussed. Based on the analysis of hydrogeological conditions, rock and soil structure characteristics and field test research, the spatial distribution characteristics of rock and soil in the study area were summarized. The study shows that Zhoukou City is located in the alluvial plain of Huanghuai, and the loose deposits of river alluvial genesis range 0-200 m. These loose deposits and groundwater stored in their pores are the main carriers of shallow geothermal energy. In the central part of the Yinghe River in the middle of the study area, the aquifer thickness is within 200 m, the particle size is coarser, the water-bearing degree and recharge capacity is better. On this basis, the paper uses AHP to evaluate the suitability of shallow geothermal energy development and utilization to guide the rational development and utilization of shallow geothermal energy resources.     

山东金青顶金矿床Ⅱ号矿体成矿特征

金青顶金矿床Ⅱ号矿体位于胶东隆起南缘,牟平乳山金成矿带中部,是目前该成矿带上最大的石英脉型金矿床。单个矿体延深之大,厚度、品位变化之稳定,且易采易选,这在胶东东部地区乃至全国尤为罕见。     

A proposed adiabatic formulation of 3‐dimensional global atmospheric models based on potential vorticity

A 2‐time‐level finite difference atmospheric general circulation model based on the semi‐Lagrangian advection of pseudo potential vorticity (which becomes potential vorticity in that part of the domain where the hybrid vertical coordinate becomes isentropic) has been formulated. At low levels, the hybrid vertical coordinate is terrain following. The problem of isentropic potential vorticity possibly becoming ill‐defined in the regions of planetary boundary layer is thus circumvented. The divergence equation is a companion to the (pseudo) potential vorticity equation and the model is thus called a PV‐D model. Many features of a previously developed shallow water PV‐D model are carried over: a modification of the PV equation needed to give computational stability of long Rossby waves; a semi‐Lagrangian semi‐implicit treatment of both the linear and the nonlinear terms; the use of an unstaggered grid in the horizontal; the use of a nonlinear multigrid technique to solve the nonlinear implicit equations. A linear numerical stability analysis of the model's gravity–inertia waves indicates that the potential temperature needs to be separated into horizontal mean and perturbation parts. This allows an implicit treatment of the vertical advection associated with the mean in the thermodynamic equation. Numerical experiments with developing baroclinic waves have been carried out and give realistic results.     

Volcanism Pacing Slumping Gravity Flow Deposits during the Late Carboniferous in the Southern Margin of the Junggar Basin,China

Deep-water gravity depositional processes and evolution in arc systems have become topics of intense research focus in recent years. This study discusses the co-evolution of volcanism and deep-water gravity flow deposits at the southern margin of the Junggar Basin, based on petrology, geochronology and geochemical analyses. The results show that a massive collapse of unstable sediments from the slope was triggered by volcanism, resulting in the formation of slumping gravity flows. The occurrence...     

Intra-continental Orogeny: Insights from Magnetotelluric Data into the Mesozoic Uplift History of the Eastern Jiangnan Orogen in South China

Despite extensive efforts to understand the tectonic evolution of the Jiangnan Orogen in South China, the orogenic process and its mechanism remain a matter of dispute. Previous geodynamic studies have mostly focused on collisional orogeny, which is commonly invoked to explain the Jiangnan Orogen. However, it is difficult for such hypotheses to reconcile all the geological and geophysical data, especially the absence of ultrahigh-pressure metamorphic rocks. Based on the magnetotelluric data, we ...     

稀有金属花岗岩富集成矿的烃类气体地球化学标志——以广西栗木锡多金属矿为例

烃类气体在自然界广泛分布并具有复杂成因和来源,同时针对烃类气体的研究不应局限于石油、天然气等传统能源矿产,而需要推广到更多其他科研领域。笔者等采取苦橄岩烃类气体标准化的研究思路,以广西栗木锡多金属矿为中心,重点围绕矿区各阶段花岗岩、矿体及地表土壤开展烃类气体宏观特征和微观规律的研究工作。通过研究和对比,揭示花岗岩及矿石中烃类气体特征和变化规律,查明在成矿作用影响下烃类气体成熟度提高且通过构造裂隙向上运移,并被地表土壤吸附形成异常的事实,明确了深部隐伏矿体与土壤烃类气体异常的成因联系及空间对应关系,建立了判断稀有金属花岗岩富集成矿的烃类气体特征指标和参数,研究表明,将烃类气体特征作为判断稀有金属花岗岩富集成矿地球化学标志的思路正确且方法可行,并将对今后进一步拓展烃类气体的研究和应用领域产生积极影响。