韶关市生态旅游资源现状分析及其开发构想   总被引：4，自引：1，他引：4  

敖惠修  夏汉平  刘世忠  何道泉  任海 《热带地理》2001,21(4):333-337

分析了韶关市资源特点和存在问题，提出开展生态旅游的原则和措施，根据各区域生态旅游资源分布特色，将韶关市分为5个森林生态旅游区，即西部自然景观区；北部特殊地貌区；东北部古生物区；中部古人类、宗教观光区；南部观光农业区。  相似文献   

天山地区地下水位动态前兆异常敏感点的初步分析(以新04井为例)     

王道 《内陆地震》1988,(3)

天山地区新04井是地下水动力学地震前兆的一个敏感点。观测事实表明,该井水位与地震活动有密切的关系。观测期间,在距该井150km范围内共发生4.0级以上地震24次,其中5.0级以上地震(未发生6.0级以上地震)5次,震前该井水位均出现了明显的下弯形异常变化。大多数4.0—4.8级地震前水位也有不同程度的异常反应。认为,特定的地质构造交汇部位、地热异常区和地下水动力差异不稳定带可能是该井水位动态灵敏反映区域地震活动的原因之一。  相似文献   

兰州马衔山北缘断裂带的新活动特征   总被引：7，自引：1，他引：7       下载免费PDF全文

袁道阳  刘百篪  才树华  刘小凤  王永成 《地震地质》2002,24(3):315-323

通过详细地质填图研究获得了兰州马衔山北缘断裂带的几何学、新活动性、断错微地貌及滑动速率等的定量资料。马衔山北缘断裂为一条历史悠久的区域性活动断裂 ,其几何形态较简单 ,总体走向N6 0°W ,全长约 115 .5km。根据断裂分叉、拐弯及不连续阶区等几何特征和活动性的差异 ,大致可以将该断裂划分为 4条次级断层段 ,自东向西分别称为内官营段、马衔山段、七道梁段和雾宿山段。断裂的新活动具分段性 ,其中的内官营段为具逆断特性的晚更新世活动段 ,而马衔山段、七道梁段和雾宿山段均为全新世活动段。该断裂早期具逆断特性 ,大约自中更新世以来以左旋走滑为主兼具倾滑运动分量 ,形成了一系列山脊、冲沟、阶地等的左旋断错 ,断距几米至几百米。沿断裂带的水平位移具分组现象 ,可能反映了断裂的黏滑活动特性。根据Ⅰ ,Ⅱ级阶地的左旋断错值及其年代 ,得到了马衔山北缘断裂带晚更新世以来的平均水平滑动速率约为 3.73mm/a。同时沿断裂带还保存有断崖和断坎等 ,其中Ⅰ级阶地上的断坎高 1～ 1.5m左右  相似文献   

新疆沙湾5.2级地震地下流体前兆异常特征的分析   总被引：4，自引：1，他引：4  

王道  张洪斌  许秋龙  王玉兰  李玉芳  段巍 《地震》1997,(3)

列举了1996年1月9日新疆沙湾5．2级地震地下流体前兆观测的最新资料，总结了地震孕育由稳态进入非稳态过程中流体异常的特征。结果表明，地下流体前兆异常以中短期为主，主要集中分布在距震中200km范围内，异常形态和幅度复杂多样，并对这次地震的跟踪预测、前兆的可靠性问题进行了讨论。  相似文献   

不相接双星的相互照射吸收和子星表面温度的变化     

陈永军  周道祺  张福俊 《中国天文和天体物理学报》1998,(4)

本文对不相接双星系统的子星间相互照射吸收进行了计算,从理论上得到子星的表面温度分布情况．对已知基本参数的３３个晚型双星系统中的反映子星等温面和等势面偏离程度的量进行了统计．结果表明,冷子星上等温面和等势面的偏离程度普遍较热子星的要大,该结果支持了Ｚｈｏｕ和Ｌｅｕｎｇ所提出的用气旋和反气旋来解释恒星黑子和太阳黑子巨大差别的可能性．本文还考虑了临边昏暗效应在晚型双星系统中对子星之间相互照射吸收的影响,这种影响达１８％以上．临边昏暗效应对热子星的影响普遍比冷子星要大．  相似文献   

关于云南天文台Tek 1024CCD的线性及其他     

姚保安  张春生  林清  秦道 《紫金山天文台台刊》1998,17(4):57-61

云南天文台新安装的Tek 1 0 2 4× 1 0 2 4CCD系统是一个很好的系统。天文上应用CCD的主要目的是测量暗弱天体 ,该系统满足这个要求。但在亮端 ,测量显示 ,当读数大于 2万多adu时 ,CCD响应对线性的偏离已经开始大于 1 % ,当读数接近 6 0 0 0 0adu时 ,响应不但是非线性的 ,而且显得不稳定。另外 ,顺便给出用 1 0 0KHz读出的bias图并作了讨论  相似文献   

岩溶发育垂直分带及其工程地质意义   总被引：1，自引：0，他引：1  

熊道馄 《四川地质学报》2004,24(2):95-98

简述了岩溶发育的垂直分带性和岩溶发育的下限深度，概述了不同类型的岩溶发育垂直分带方案，讨论了现有岩溶发育垂直分带的特点。  相似文献   

Change in carbon flux (1960–2015) of the Red River (Vietnam)     

Thi Phuong Quynh Le  Nhu Da Le  Viet Nga Dao  Emma Rochelle-Newall  Thi Mai Huong Nguyen  Cyril Marchand  Thi Thuy Duong  Thi Xuan Binh Phung 《Environmental Earth Sciences》2018,77(18):658

Global riverine carbon concentrations and fluxes have been impacted by climate and human-induced changes for many decades. This paper aims to reconstruct the longterm carbon concentrations and carbon fluxes of the Red River, a system under the coupled pressures of environmental change and human activity. Based on (1) the relationships between particulate and dissolved organic carbon (POC, DOC) or dissolved inorganic carbon (DIC), and suspended sediments (TSS) or river water discharge and on (2) the available detailed historical records of river discharge and TSS concentration, the variations of the Red River carbon concentration and flux were estimated for the period 1960–2015. The results show that total carbon flux of the Red River averaged 2555?±?639 kton C year^?1. DIC fluxes dominated total carbon fluxes, representing 64% of total, reflecting a strong weathering process from carbonate rocks in the upstream basin. Total carbon fluxes significantly decreased from 2816 kton C year^?1 during the 1960s to 1372 kton C year^?1 during the 2010s and showed clear seasonal and spatial variations. Organic carbon flux decreased in both quantity and proportion of the total carbon flux from 40.9% in 1960s to 14.9% in 2010s, reflecting the important impact of dam impoundment. DIC flux was also reduced over this period potentially as a consequence of carbonate precipitation in the irrigated, agricultural land and the reduction of the Red River water discharge toward the sea. These decreases in TSS and carbon fluxes are probably partially responsible for different negatives impacts observed in the coastal zone.  相似文献   

Three‐dimensional indoor network accessibility auditing for floor plan design          下载免费PDF全文

Thi Hong Diep Dao  Jean‐Claude Thill 《Transactions in GIS》2018,22(1):288-310

Built environments have played an increasingly important and complex role in contemporary cities in the face of the significant number of discretionary and non‐discretionary event‐based activities that take place indoors, and the great variety of three‐dimensional designs that indoor spaces have grown to assume. However, intelligent tools that can assist designers to achieve high accessibility, particularly for large and complex buildings, are still underdeveloped. This article presents an innovative custom computer‐based design tool, dubbed FloorplanAAU (floor plan accessibility auditing), that couples GIS data modeling, indoor traversable network accessibility analysis, and interactive three‐dimensional visualization for built environments, to interactively evaluate and audit floor plans for high accessibility. The proposed method contributes to the success of applying GIS and transportation geography concepts to establish computational tools toward intelligent design and assessment of built environments.  相似文献   

The October 13, 2020, deadly rapid landslide triggered by heavy rainfall in Phong Dien,Thua Thien Hue,Vietnam     

Van Tien  Pham  Trinh  Phan Trong  Luong  Le Hong  Nhat  Le Minh  Duc  Dao Minh  Hieu  Tran Trung  Cuong  Tran Quoc  Nhan  Tran Thanh 《Landslides》2021,18(6):2329-2333

Landslides - At about 12:00 a.m., on October 13, 2020, a rapid rotational landslide induced by rainfall swept over Ranger Station-7 in Phong Xuan commune, Phong Dien district, Thua Thien Hue...  相似文献