上海城市发展的环境问题及其对策研究     

姚士谋  刘塔 《云南地理环境研究》1993,5(1):40-47

上海市的发展战略;空间布局模式和环境管理是文章讨论的三个主要问题。作者认为:(1)战略设想要立足于上海的发展,“开发浦东、振兴上海、服务全国、面向世界;”(2)新的空间布局模式应为“逐步形成新的CBD,强化和完善金融和服务功能”;(3)城市发展和环境建设要协调。文章着重讨论了上海城市发展中出现的环境问题及其治理的对策和措施。  相似文献   

Soil gas radon concentrations along the Ganos Fault (GF)     

Osman Günay  Müslim Murat Saç  Mutlu İçhedef  Caner Taşköprü 《Arabian Journal of Geosciences》2018,11(9):213

In this study, soil radon levels have been measured for the first time across the Ganos fault (GF), which is known as the western part of the North Anatolian Fault Zone. LR 115 Type 2 Solid State Nuclear Track Detectors (time integrated) have been applied to determine soil gas radon levels, and the survey was performed in 16 stations along the fault line. The results showed that soil gas radon concentrations and variation of concentration levels are comparable high along the fault line. It is also observed that in the middle of the Ganos Fault, fairly elevated radon levels were detected. These can be related to the activity of the fault lines. It is confirmed that the study area has a very active tectonic structure and is great location for analyzing radon variations.  相似文献   

An Analysis of Programs Managed by Division of Geography,Department of Earth Sciences,National Natural Science Foundation of China     

Zhang Chaolin  Zheng Yuanming  Fan Wenjie  Shen Xiangjin  Zhang Jing  Ta Na  Peng Shuangyun 《地球科学进展》2018,33(12):1272-1281

  相似文献   

一次极端寒潮天气过程等熵位涡分析     

谢瑞青  刘宇迪  朱金双  孟他 《气象科技》2019,47(2):312-321

利用2016年1月1日至31日的FNL资料,对一次极端寒潮天气过程进行了等熵位涡分析。结果表明:高位涡主体由极涡分裂而来,前面低位涡区的阻挡与后侧低位涡大气的北上加强了位涡的经向交换,高位涡空气不断由极地向南输送,使得高位涡主体不断加强维持。高位涡在由北向南移动的同时,也由对流层顶向下输送。此次寒潮过程主要有3股冷空气由上而下发展,位置均在高空急流轴的北侧,最南端的一股下沉气流最旺盛,这是其与高空急流相互作用的结果。强盛的冷空气下沉使得寒潮影响范围触及我国华南地区。随着高位涡的向南向下传输,一方面引起对流层中高层低涡系统迅速发展,当它移到中国东部地区时,东亚大槽迅速加深,使槽后强冷空气迅速向南爆发;另一方面,在高位涡输送的过程中,其后侧有强烈的下沉运动,使得地面冷高压快速发展,导致强寒潮天气的爆发。  相似文献   

基于大数据的上海中心城区建成环境与城市活力关系分析   总被引：8，自引：3，他引：8  

塔娜  曾屿恬  朱秋宇  吴佳雨 《地理科学》2020,40(1):60-68

运用大众点评数据、出租车到达数据与文化设施POI数据测度城市活力的经济、社会和文化维度,在街区和街道层面分析城市活力的空间结构特征,建立计量模型分析城市建成环境对城市活力的影响关系。结果表明：①上海中心城区城市活力表现出明显的空间差异,主要表现为由中心向四周递减、浦西优于浦东的总体特征;②街区和街道尺度影响城市活力的建成环境因素存在差异;③街区尺度建成环境对城市社会、经济和文化活力的影响存在差异：提升人口密度对经济活力具有正面影响,过高的人口密度可能不利于社会和文化活力发展;增加POI密度、路网密度和POI混合度有利于城市活力的提升;建筑层数和建筑密度的增加会降低街区的社会活力和文化活力,但会提升街区的经济活力;交通可达性有利于经济活力的提升。  相似文献   

豫西三门峡地区温塘断裂第四纪活动性研究     

乔龙  王磊  郭长辉  塔拉  沈小七 《震灾防御技术》2022,17(2):252-260

温塘断裂位于鄂尔多斯块体东南缘,是三门峡盆地的东边界控制断裂,准确厘定其活动性对于理解区域构造演化和判断三门峡地区地震危险性具有重要意义。运用野外地质地貌调查、联合钻孔剖面探测及光释光定年技术,对三门峡地区温塘断裂的活动性进行分析与研究。结果表明,温塘断裂南段出露地表,线性特征明显,断层最新活动时代为晚更新世;温塘断裂中段为第四纪隐伏断裂,断层活动时代为中更新世;温塘断裂北段断层出露,断层活动时代为中更新世。  相似文献   

戈壁风沙流结构特性及其意义     

屈建军  黄宁  拓万全  雷加强  董治宝  刘贤万  薛娴  俎瑞平  张克存 《地球科学进展》2005,20(1):19-023

通过砾质戈壁风沙流野外实测数据的分析以及风洞模拟实验研究发现：戈壁风沙流结构具有与沙漠风沙流完全不同的风沙流特征,戈壁风沙地表的粗糙度随风速的增大而增加,其表面风沙流输沙量高度分布表现出独特的"象鼻"效应,在一定高度处呈现最大值,并随风速的增加而增高。该"象鼻"效应导致戈壁风沙流结构特征值λ远大于 1,不论风速多大,风沙流都处于未饱和状态的非堆积搬运状态。这种特殊性质比较清楚地解释了敦煌莫高窟千年来不被沙山埋没的谜底。并且在风沙防治工程实践中,采用砾石压沙措施,构造类似与砾质戈壁的下垫面,人工促使风沙流结构呈现"象鼻"形状,可使防沙工程达到理想的输导作用。  相似文献   

Wind tunnel simulation experiment and investigation on the electrification of sandstorms     

QU Jianjun  YAN Muhong  DONG Guangrong  ZHANG Hongfa  ZU Ruiping  TUO Wanquan  ZHAO Aiguo  XlAO Zhenghua  LI Fang & YANG Bao Key Laboratory of Desert  Desertification  Cold  Arid Regions Environmental  Engineering Research Institute  Shapotou Desert Research  Experiment Station  Chinese Academy of Sciences  Lanzhou  China 《中国科学D辑(英文版)》2004,47(6):529-539

~~Wind tunnel simulation experiment and investigation on the electrification of sandstorms~~  相似文献   

Changes in biodiversity of the extremely polluted Golden Horn Estuary following the improvements in water quality     

Yüksek A  Okuş E  Yilmaz IN  Aslan-Yilmaz A  Taş S 《Marine pollution bulletin》2006,52(10):1209-1218

Long-term biological data supported by physicochemical parameters were evaluated to investigate the biodiversity of the Golden Horn Estuary from the past to the present. Limited observations dating back to 60 years ago indicated the existence of a diverse community in this small estuary. Unfortunately, in parallel with the increase in unplanned settlements and industry around the Golden Horn, pollution stress increased since the 1960s. Preliminary studies in the 1990s indicated survival of only a couple of pollution-resistant species, in the relatively cleaner lower estuary. Following the intensification of rehabilitation studies in 1998 and particularly after the opening of the floating bridge at the mid estuary; a remarkable day-by-day recovery in marine life has begun with the improving water quality. Nutrient concentrations decreased markedly; while water clarity significantly increased. Fecal coliform values decreased 10(3) fold. Phytoplankton composition changed and dense blooms of eukaryotic phytoplankters frequently occurred. Hydrogen sulfide almost completely disappeared even during the warmest periods of the year and dissolved oxygen concentrations increased. All results clearly depicted that the Golden Horn ecosystem shifted to eutrophic conditions from an anoxic environment. SCUBA dives in 2002, documented the level of diversification of life in the Golden Horn. All appropriate substratums were intensely covered by macrobenthic forms until the Halic Bridge and filter feeders dominated the plankton-rich ecosystem. Achieving the diversity of 1940s is not possible since the Black and Marmara seas, influencing water quality of the Golden Horn, are also suffering from anthropogenic impacts and are far less diverse than their rich diversity in 1940s. However, the Golden Horn is a good example that even the most polluted ecosystems can recover when appropriate measures are taken.  相似文献   

Gas/Substrate Fluxes and Microbial Community in Phenol Biodegradation Using an O2‐Based Membrane Biofilm Reactor          下载免费PDF全文

Özge Hanay  Ergin Taşkan  Burçin Yıldız  Halil Hasar  Eoin Casey 《洁净——土壤、空气、水》2014,42(1):36-42

  相似文献