Developing a comprehensive evaluation method for Interconnected River System Network assessment: A case study in Tangxun Lake group     

Yang  Wei  Zhang  Liping  Zhang  Yanjun  Li  Zongli  Xiao  Yi  Xia  Jun 《地理学报(英文版)》2019,29(3):389-405

Journal of Geographical Sciences - The Interconnected River System Network (IRSN) plays a crucial role in water resource allocation, water ecological restoration and water quality improvement. It...  相似文献   

近六百年来长江三角洲地区城镇空间与城镇体系格局演变分析     

覃丽君  金晓斌  蒋宇超  薛樵风  成一农  龙瀛  杨绪红  周寅康 《地理研究》2019,38(5):1045-1062

基于历史文献、古地图和现代遥感数据,引入历史学古代城镇形态复原方法,复原（提取）明代以来长江三角洲地区113座城镇7个时间断面（1461年、1820年、1930年、1970年、1980年、2000年和2010年）下的城镇边界,采用扩张速率、扩张效率、首位度指数和位序-规模法则,分析了近六百年来区域城镇空间与城镇体系等级规模演变格局。取得以下研究结果：\mathrm{①}研究时段内,区内城镇用地总规模由205.98 km²增加到6442.19 km²,扩大了31.27倍;城镇扩张经历了萌芽阶段（明清时期）、起步阶段（民国至改革开放前夕）、成长阶段（改革开放至2000年）和加速阶段（2000—2010年）,城镇扩张速率不断加快,但扩张效率有待提升;\mathrm{②}在城镇等级规模空间格局上,明清时期南京与苏州为区内的一级城镇,民国后,上海逐渐取代其地位,从五级城镇发展成为区域核心城镇,四级以上城镇主要集中在长江干流沿岸和太湖流域,五级以下城镇大多集中在安徽;城镇体系呈首位型分布,城镇首位度较高,且改革开放后的城镇首位度较明清与民国时期要高,不同等级规模城镇之间差距扩大,大城镇优势较强。近30年,长江沿岸城镇发展加速,苏锡常都市圈、南京都市圈等逐渐形成并快速发展。  相似文献   

Evaluation System for Yunnan Cultural Tourism Routes Based on a Five Component Model: Case Study of the Ancient Tea-horse Road in the South of Yunnan     

WANG Yan  XIE Hongzhong  ZHU Tao 《资源与生态学报(英文版)》2019,10(5):553-558

Cultural tourism routes can reveal and protect cultural tourism heritage by means of cultural tourism in the “time category” and the “space category”. The construction of an evaluation system for cultural tourism routes and the evaluation, scoring and grading of existing and potential cultural tourism routes are the key to the protection of heritage, history and culture along these routes, and the key to encouraging the standardization, branding and sustainable development of various formats on the routes. Yunnan cultural tourism routes are diverse and rich in resources, and their developmental foundation is good. However, the tourism development and cultural development activities occur along separate lines and there is a lack of unified management. Therefore, it is necessary to conduct research on information collection, information analysis, problem diagnosis and improvement of status in the local practices of Yunnan cultural tourism routes, and to guide the sustainable development of Yunnan cultural tourism routes. Based on the advanced experience of COE (Council of Europe), UNESCO WHC (United Nations Educational, Scientific and Cultural Organization, World Heritage Committee) and ICOMOS(International Council on Monuments and Sites), this paper comprehensively analyzes the decisive criteria for line evaluation by interpreting and summarizing the connotations of cultural tourism routes, and determines that the evaluation of cultural tourism routes should include lines. Five aspects―the theme, the participating subject, the object itself, related activities and multi-party value―are used to construct a five-component model. At the same time, based on the consumer utility function, a complete route evaluation and hierarchical system is constructed. Then, taking the Ancient Tea-horse Road cultural tourism route as an example and using the expert scoring method and the analytic hierarchy process, the actual scores and grades of the Ancient Tea-horse Road cultural tourism route are determined, and countermeasures and suggestions for its sustainable development are proposed. The paper also verifies the applicability and practicability of the evaluation system, and promotes and improves the feedback evaluation system. The aim is to at promote and widely apply the evaluation system of cultural tourism routes, realizing the transformation from individual cases to joint cases, and promoting the standardization and sustainable development of cultural tourism routes.  相似文献   

基于水资源约束的中国城镇化SD模型与模拟   总被引：1，自引：0，他引：1  

曹祺文  鲍超  顾朝林  管卫华 《地理研究》2019,38(1):167-180

中国城镇化正处于快速发展阶段,尽管经济和社会发展主控要素还在发挥重要作用,但水资源在生产、生活和生态方面发挥主控作用的局面愈益明显。在中国城镇化系统动力学（system dynamics,SD）模型基础上,从水资源供给、需求和水环境等层面将水资源作为主控要素嵌入原有模型中,拓展出基于水资源约束的中国城镇化SD模型,并对水资源利用进行了多情景模拟。结果表明：① 系统存流量和灵敏度检验证明模型模拟效果良好,具有可操作性。② 部门用水效率一定时,产业发展对水资源供需平衡的影响比人口增长更为明显。③ 在实行节水农业、节水工业、高生活需水、高生态环境需水和高再生水利用的综合协调方案中,2050年中国城镇化的发展约共需6789.70亿 m³水资源,基本实现水资源供需平衡。  相似文献   

乡村农户旅游适应效果、模式及其影响因素——以西安市和咸阳市17个案例村为例     

何旭  杨海娟  王晓雅 《地理研究》2019,38(9):2330-2345

乡村旅游地面临人地交互作用的剧烈变迁,内部要素适应社会-生态系统变化,趋利避害降低脆弱性具有重要现实意义。本文重新界定基于恢复力和脆弱性的农户适应性理论内涵,构建旅游开发适应力指标体系,以西安市和咸阳市17个不同类型的城郊型乡村旅游地为例,评价和分析农户旅游适应效果与空间差异规律,探讨和归纳适应行为与对策模式,建立BP神经网络辨别和揭示适应性影响因素与重要性关系。研究表明：① 西安市和咸阳市农户适应旅游开发综合效果呈现中等偏下水平的偏态分布趋势,分别处于旅游地生命周期快速发展阶段和探索起步阶段。② 乡村旅游地农户适应效果形成“圈层辐射、两翼包络、外围联动”的县域尺度空间分布格局;村域尺度圈层分化现象显著。③ 经营模式划分的旅游乡村农户适应效果股份制模式>“公司+农户”模式>“政府+公司+农户”模式>个体农庄模式>“农户+农户”模式;常年外出务工和农家乐经营是农户主要适应行为选择,季节性务工、本地上班以及农业生产是辅助适应行为选择,且适应行为组合方式表现为旅游专营型、旅游主导型、均衡兼营型、务工主导型和务农主导型五种适应对策模式。④ 旅游发展机会认知、技能培训机会、社会联结度、劳动力总量、政策知晓度、旅游就业人数、收入来源种类、生活主要能源、受教育程度、公共服务设施是农户主要旅游适应性影响因素。据此,提出后续社会-生态整合研究亟需突破方向和适应旅游开发的政策路径。  相似文献   

Socio-political and ecological stresses on traditional pastoral systems: A review     

Muhammad  Khurshid  Mohammad  Nafees  Abdullah  Khan  Mehmet  Somuncu  Ashfaq  Ahmad Khan  Wajid  Rashid 《地理学报(英文版)》2019,29(10):1758-1770

Journal of Geographical Sciences - Pastoralism is a viable socio-economic system-shaped by landless and agro-pastoral communities in many pastoral regions of the world. This system is mainly based...  相似文献   

残余位移反应谱的参数影响研究     

李宇  梁亚东  李琛 《震灾防御技术》2019,14(4):790-796

从PEER强震数据库中选取4类场地的320条地震动记录作为输入，采用BISPEC程序对非线性单自由度（SDOF）体系（周期T=0.05—5s）进行非线性时程分析，得到相应的残余位移反应谱（Dres），进而研究地震动特性和恢复力模型动力参数对Dres的影响，得到如下结论:①Dres谱值随震级和PGA的增加而增大；其他设防烈度的Dres可由PGA_其他与PGA_基准之比调整基准烈度的Dres得到。②场地土较硬时，场地类型对Dres的影响较小；场地土较软时，Dres谱值随土质的变软而增大。③当位移延性比μ较小时，屈服后刚度比η对Dres的影响可忽略；但当μ较大时，Dres谱值随η的增加而减小。另外，Dres谱值还随阻尼比ξ的增加而减小。④随着T或μ的增大，Dres谱值均呈递增趋势；但当μ>3后，μ对Dres谱值的影响有所下降。  相似文献   

A natural gas hydrate-oil-gas system in the Qilian Mountain permafrost area,northeast of Qinghai-Tibet Plateau     

《China Geology》2020,3(4):511-523

Natural gas hydrate, oil and gas were all found together in the Qilian Mountain permafrost area, northeast of Qinghai-Tibet Plateau, China. They are closely associated with each other in space, but whether they are in any genetic relations are unknown yet. In this paper, a hydrocarbon gas-generation series, gas-fluid migration series and hydrocarbon gas-accumulation series are analyzed to probe the spatial, temporal and genetic relationships among natural natural gas hydrate, oil and gas. The subsequent results show that natural gas hydrate, oil and gas actually form a natural gas hydrate-oil-gas system. Based on the Middle Jurassic and the Upper Triassic hydrocarbon gas-generation series, it is divided into four major sub-systems in the study area: (1) A conventional Upper Triassic gas-bearing sub-system with peak hydrocarbon gas-generation in the late Middle Jurassic; (2) a conventional Middle Jurassic oil-bearing sub-system with low to mature hydrocarbon gas-generation in the late Middle Jurassic; (3) a natural gas hydrate sub-system with main gas source from the Upper Triassic gas-bearing sub-system and minor gas source from the Middle Jurassic oil-bearing sub-system as well as little gas source from the Middle Jurassic coal-bed gas and the microbial gas; (4) a shallower gas sub-system with microbial alteration of the main gas source from the Upper Triassic gas-bearing sub-system. This natural gas hydrate-oil-gas system and its sub-systems are not only theoretical but also practical, and thus they will play an important role in the further exploration of natural gas hydrate, oil and gas, even other energy resources in the study area.  相似文献   

利用偏光显微镜反射光系统观察黑色生油岩电子探针薄片中的生烃母质特征     

郑庆华  刘行军  刘乔  梁秀玲  张小龙  左琴  杨开艳  马婷  许锋 《岩矿测试》2020,39(3):442-450

鄂尔多斯盆地上三叠统延长组长7油层组的黑色泥岩、油页岩等黑色生油岩薄片中的生烃母质,因黑色石油、沥青等黑色有机质的覆盖或不透明,导致其在偏光显微镜透射光系统下观察常局部或整体呈现为黑色。因此,建立一种黑色生油岩薄片中生烃母质有效观察的方法,对致密油、页岩油的生烃研究具有重要的理论和实际意义。本文提出了一种利用电子探针薄片和偏光显微镜的反射光系统观察黑色生油岩中生烃母质特征的方法。该方法能够克服黑色生油岩薄片中生烃母质因被黑色有机质覆盖或不透明,而在偏光显微镜的透射光系统下局部或整体呈黑色的弊端,能够对生烃母质的大小、形态、结构、分布和物质成分等特征进行整体且清晰的观察。实践表明,本文提出的利用偏光显微镜反射光系统观察黑色生油岩电子探针薄片中生烃母质特征的方法,简单有效,易在致密油、页岩油的生烃研究领域推广使用。  相似文献   

Kirchhoff型偏移反偏移串联地震数据炮检距转换技术          下载免费PDF全文

叶云飞  孙建国  刘志斌  张益明  孙文博  仝中飞 《地球物理学报》2018,61(9):3783-3790

零炮检距数据在海洋地震资料处理中有很多优势和用途，然而，受海洋水平拖缆地震采集作业方式的限制，接收数据的最小炮检距一般在200 m左右，小于该炮检距的数据是无法直接获得的.通常的做法是通过对较大炮检距数据进行动校，通过外推来变相获得零炮检距（包括小炮检距）数据，其外推的精度会受到地震资料信噪比、动校正速度的精度等因素影响，并且保幅性较差.本文通过一种基于Kirchhoff真振幅偏移和反偏移串联的技术，在反偏移过程中改变观测系统，有效实现了大炮检距反射地震数据向零炮检距（包括小炮检距）数据之间的转换，且很好地保持了零炮检距（包括小炮检距）数据的振幅特性.同时，经偏移-反偏移串联处理后，有效压制了地震数据中的随机噪声，地震资料信噪比和成像精度均得到显著提高.  相似文献