深层地热能开发及其对地热水流场的影响

为了研究深层地热能开发对热储层流场造成的影响,选取兰考县深层地热能开发为研究对象,分析研究区新生代以来的地质结构和区域构造特征,调查地区地热开采情况及存在的问题。根据地热能类型分析了第四系Q、新近系明化镇组N₂、新近系馆陶组N₁等3个热储层特征,利用可控源音频大地电磁测深查明区内的断裂分布、热储层发育、隔水边界等条件,通过现场试验与测试手段查明不同部位热储层的参数指标,分区计算各层的地热资源量。根据开采方式、边界条件、水文地质参数建立数学模型,通过数值模拟预测出2023年Q热储层流场将恢复到原始流场模式,N₂热储层流场漏斗效应持续减弱,N₁热储层流场漏斗效应明显且分布不规则,为控制地热资源开发对环境造成的影响,提出封闭循环利用地热、同层加压回灌的开采方式及合理布局开采井、综合利用多层地热等措施,为本地及周边地区地热资源开发及环境保护提供参考。      

四川盆地西南缘雅安-名山地区青衣江古河道的变迁及蒙顶山背斜的隆起

晚新生代以来,由于青藏高原的隆起,四川盆地周边及盆地内部,发育众多的褶皱变形及逆冲断裂.四川盆地西南缘的雅安-名山地区也发育系列褶皱变形如蒙顶山背斜.根据野外实地调查、DEM及卫星遥感影像的解译,古青衣江的一条古代主干河道在蒙顶山背斜被识别出来,该古河流控制了名邛台地的冲-洪积沉积.伴随古青衣江上游发生河流改道事件,名邛台地也停止发育,一段废弃河道在蒙顶山中被保留下来,并在蒙顶山背斜持续褶皱过程中,河流纵剖面遭受变形.根据名邛台地的ESR测年,可确定古青衣汀被袭夺事件发生在312±3.0ka,结合河流纵剖面变形的几何计算,获得背斜开始发育的时间为3.2～3.8Ma,蒙顶山背斜相对于下里向斜的隆升速率为0.46mm/a.研究结果可以限定该地区褶皱构造活动的起始时间、变形速率以及山体的剥蚀速率.     

快速提取震前热红外异常的均线差值振幅增强比方法

1 研究背景 四川省大震多发,如2008年汶川MS 8.0(31°N,103.4°E)地震、2013年雅安芦山MS 7.0地震(30.3°N,103°E)和2017年九寨沟MS 7.0地震(33.2°N,103.8°E)均发生在该省,魏乐军等(2008)、马瑾等(2010)、张元生等(2002)、路茜等(2014)相继对地震进行了热红外异常的研究,采用的方法有小波法、距平法、功率谱法等.本文运用的计算机程序化的均线差值振幅增强比法,可快速提取震前热红外异常,且异常的时空特征显著、直观.     

砷污染饮用水治理修复技术研究进展

水体砷污染是全球饮用水主要威胁之一。研究高效、廉价的饮用水除砷技术,对于解决地方性砷中毒具有重要意义。系统的介绍了国内外各种除砷工艺和方法,总结了目前各种方法在应用上的优缺点及发展前景。     

整合海洋教育资源 加快海洋人才培养

海洋人才对于海洋强国战略的实施具有举足轻重的作用。但是由于海洋教育资源分散,海洋人才培养模式单一,使得我国的海洋人才供给难以有效适应现实的需要。因此,对于海洋类高校而言,需要进一步明确海洋人才培养目标,整合海洋教育资源,创新海洋人才培养教学模式,与现实保持密切的互动,加快我国海洋人才的培养。     

ASTROD-GW时间迟延干涉

ASTROD-GW (ASTROD [Astrodynamical Space Test of Relativity using Optical Devices] optimized for Gravitation Wave detection)是ASTROD专注于引力波探测的优化方案,组成任务的3个航天器分别位于日地拉格朗日点L3、L4和L5点附近,组成臂长为2.6× 108 km的干涉阵列.根据优化得到的ASTROD-GW 20 yr任务轨道,利用CGC2.7 (CGC:Center for Gravitation and Cosmology)星历,采用适当数值计算的方法,对引力波探测中所用到的时间迟延干涉路径进行分析和计算.     

NUMERICAL SIMULATION STUDY OF THE INNER-CORE STRUCTURES AND THE MECHANISM FOR INSHORE STRENGTHENING OF SOUTH CHINA SEA TYPHOON VONGFONG (0214) DURING LANDFALL

An explicit simulation with a fine mesh at intervals of 6 km is used to explore the inner-core structures of Vongfong (0214). The dynamic mechanism for the inshore strengthening of Vongfong is examined. It is found as follows. (1) The radius of maximum wind of the axisymmetric structures of the typhoon decreased with height during its mature stage. When Vongfong was inshore, the strongest low-layer inflow located in front of it and the outflow was to the rear of it, which was just reversed from the Atlantic hurricanes and other Pacific typhoons. (2) The dynamic and thermodynamic fields were highly asymmetric in structure. Convection was stronger in the northwest quadrant of the typhoon than in the southeast; the strongest convective cloud bands were consistent with the maximum wind region. During its strengthening stage, it was cold west of and warm east of the eye in the lower layer but warm in the west and cold in the east of the mid-upper layer. During its mature stage, a warm-core structure was evident in the lower and middle-upper layer. (3) The interactions between a mid-latitude cold low in the middle-upper troposphere and the typhoon were responsible for the latter to strengthen inshore. Firstly, the outer circulation of the cold low entered the typhoon from the middle troposphere when an outer cold airflow from the cold low flowed into the northwest quadrant of the typhoon so that geopotentially instable energy increased and convection developed. Secondly, the downdraft in the cold low was just the corresponding branch of the secondary circulation of the typhoon system; when the cold low weakened while moving south, the typhoon strengthened inshore. Due to the CISK mechanism, these two phenomena might be realized.     

地理课堂讨论需注意的几个问题

1．学生座位编排问题。传统的方形座位排列不利于很多学生面对面讨论．且教室后边学生距前台老师较远，不便于教师引导和控制讨论的进程。因此采用其他利于师生、生生讨论、交流的座位编排方式，如面向教师的弧形排列；或将课桌抽走、学生分组聚集在一起，或在方形座排列方式下采用相邻前后位共四个学生编成一组讨论形式等等。目前形势下，地理教学中采用最后一种讨论形式，便于老师组织、观察和操作。