沙地地表结皮的研究

本文根据陕西省榆林地区红石峡沙地的调查资料,分析了沙地地表结皮的形成过程及其组成,并着重讨论了地表结皮对降雨补给土壤水分所产生的影响,以及对进一步研究地表结皮提出了几点建议。     

Seasonal cycle of topography in the Bohai Sea and Yellow Sea and its relationships with atmospheric forcing and oceanic adjustment based on altimetry data

Seasonal cycle is the most significant signals of topography and circulation in the Bohai Sea (BS)and Yellow Sea (YS) forced by prevailing monsoon and is still poorly understood due to lack of data in their interiors. In the present study, seasonal cycles of topography in the BS and YS and its relationship with atmospheric forcing and oceanic adjustment were examined and discussed using TOPEX/Poseidon and ERS-I/2 Sea Level Anomalies (SLA) data. Analyses revealed complicated seasonal cycles of topography composed mainly of 2 REOF modes, the winter-summer mode (WlM) and spring-autumn mode (SAM). The WlM with action center in the BS displayed peak and southward pressure gradient in July, and valley and northward pressure gradient in January, which is obviously the direct response to monsoon with about l-month response time. The SAM with action center in the western south YS displayed peak and northward pressure gradient in October and valley and southward pressure gradient in April. After the mature period of monsoon, the action center in the BS becam eweakened while that in the western south YS became strengthened because of regional convergence or divergence induced by seasonal variations of the Taiwan Warm Current and Yellow Sea Coastal Current. The direct response of topography to monsoon resulted in the WIM, while oceanic adjustment of topography played an important role in the forming of the SAM.     

云南九龙河流域的水文地质遥感影像特征研究

应用遥感手段对云南九龙河流域的自然地理条件、岩性构造进行研究,建立了相应的遥感标志,在此基础上,根据流域水文地质综合分析研究内容,建立了水文地质要素遥感影像的解译标志,研究了其水文地质遥感影像特征。     

淄博市淄川区地质灾害防治及建议

淄川区位于淄博市中部,属于经济发达区,除采矿业、陶瓷业的繁荣外,其他工业、交通及公共设施建设也在迅速发展,随着经济发展,地质灾害的危险因素也日益增加,滑坡、崩塌、采空塌陷随时可能发生。该文根据多年地质灾害防治工作情况,综合分析淄川区地质灾害现状和特点,对地质灾害防治提出建议。     

河谷型城市居住环境剥夺的识别及其影响因素——以兰州市主城区为例

居住环境质量提升是城市高质量发展的重要内容,而其设施的不均衡性、可获取性与可选择性差异对居民的生活质量、情感需求具有显著的剥夺影响。本研究以兰州市主城区居住区为研究对象,以各类城市设施的POI为数据源,通过构建居住环境剥夺评价体系定量识别其剥夺程度并对影响因素作出分析,结果表明：① 居住环境的综合剥夺在东西狭长的河谷城区上呈现出重心偏东的“核心-边缘”分布格局,高剥夺区集中在河谷边缘区以及西部城区,低剥夺区呈现于河谷中心区与东部城区。② 居住环境的正向维度基本呈现出河谷中心区剥夺程度低,河谷边缘区剥夺程度高的态势;负向维度在空间上则呈现出与正向维度反向的分布趋势。③ 河谷型城市居住环境剥夺格局是城市形态、居住区区位、城市的动态扩张次序、居住区密度以及政策规划等多重因素共同导致的结果。其中,城市形态下的空间可达性制约着城市空间的开发时序,进而影响设施的空间配置水平;居住区区位制约着居住区自身对设施的选择性与环境干扰性;城市的动态扩张导致了河谷城市开发周期的不同,进而导致新旧城区设施配置的不同;居住区密度对城市设施的配置具有一定的引导作用;政策规划对居住环境剥夺格局具有重构作用。     

Interannual variation of East Asian summer monsoon and its impacts on general circulation and precipitation

Using NCEP/NCAR reanalysis geopotential height (GHT) and wind at 850 hPa, GHT at 500 hPa, precipitation rate, sea level pressure (SLP) and precipitation observations from more than 600 stations nationwide in June–August from 1951 to 2006, and focusing on the East Asia–West Pacific region (10o–80oN, 70o–180oE), interannual variation of East Asian summer monsoon (EASM) and its correlations with general circulation and precipitation patterns are studied by using statistical diagnostic methods such as 9-point high pass filtering, empirical orthogonal function (EOF) analysis, composite analysis and other statistical diagnosis, etc. It is concluded as follows: (1) EOF analysis of SLP in the East Asia–West Pacific region shows the existence of the zonal dipole oscillation mode (APD) between the Mongolia depression and the West Pacific high, and APD index can be used as an intensity index of EASM. (2) EOF analysis of GHT anomalies at 500 hPa in the East Asia–West Pacific region shows that the first EOF mode is characterized with an obvious meridional East Asian pattern (EAP), and EAP index can also be used as an EASM intensity index. (3) The composite analysis of high/low APD index years reveals the close correlation of APD index with EAP at 500 hPa (or 850 hPa). The study shows an obvious opposite correlation exists between APD index and EAP index with a correlation coefficient of –0.23, which passes the confidence test at 0.10 level. (4) Both APD and EAP indexes are closely correlated with precipitation during flood-prone season in China and precipitation rate over the East Asia–West Pacific region. The significant correlation area at 5% confidence level is mainly located from the southern area of the Yangtze River valley to the ocean around southern Japan, and the former is a positive correlation and the latter is a negative one.     

持续发展初论─-兼谈持续发展的方法、对策和措施

人类面临的环境与发展问题要求实行持续发展国家战略.本文论述了持续发展的必要性、定义、目标及持续发展的方法、对策与措施.其中包括环境成本-效益分析、资源分析、承载力分析、宏观政策和不同类型规模的工农业生产系统分析.     

黄河水下三角洲铁板砂形成的探讨

黄河水下三角洲浅表存在一定厚度的硬壳层,俗称\     

喀木斯特区晚古生代沉积相及弧缘盆地演化

新疆北部准噶尔喀木斯特区在晚古生代是一发育在介于大陆—大洋过渡性质地壳为基底的边缘盆地。以下泥盆统和下石炭统为主的上古生界 ,以岛弧造山带为主要物源区的碎屑岩为主要组成岩石 ,碎屑岩主要视粒度差别划分为 A— E五类 ,依组分再分成亚相 ;碳酸盐岩或硅质岩依成分划分为 G相 ;熔岩火山碎屑岩划为 V相。较大范围内两个或两个以上岩相组成斜坡—海底峡谷、海底扇、盆地平原三个相组合。区内岩相特征和沉积相演化综合表明 :下泥盆统由下而上沉积环境从斜坡上部过渡为下部 ,沉积序列为退积型 ;下石炭统沉积环境由外扇—盆地平原 ,中扇下部 ,中扇上部再过渡为中扇下部 ,沉积序列为进积退积型。弧缘盆地演化经历了孕育期、发展期、成熟期和退缩期四个阶段     

武陵山片区旅游空间模式对运输通道演化的响应机理研究

基于旅游通道类型和特征的分析,从通道的技术装备水平、运输能力和交通服务水平3个维度考虑,将旅游运输通道演化划定3个阶段,即滞后型、发展型、完备型旅游运输通道;从分析旅游运输通道演化机制的视角,从旅游景点出现率、旅游线路空间模式、旅游线路选择集中度、旅游线路重复系数、集散中心等5个方面,对武陵山片区旅游线路进行统计分析,...