重庆钢铁公司岸坡古滑坡系统形成机制研究     

胡新丽 《地质科技情报》1998,(Z2)

系统分析了重庆钢铁公司岸坡古滑坡系统的地质条件,提出了从新构造运动、河谷演变着手,依据系统发展的观点,研究滑坡系统形成机制的方法。分析结果表明该古滑坡系统由多级滑坡体组成,各滑体在时空上具有成生联系,目前滑坡系统除三角地带古滑体需整治外,其余地段均处于稳定状态。  相似文献   

文化元素在我国旅游景区中的应用研究——以江门市鹤山昆仑山为例     

梁湘萍  许新立 《热带地理》2011,31(4)

在RMP和RMTP理论框架基础上,加入文化元素(Element)的提取方法,创新性提出RMTPE理论的基本框架,并以江门市鹤山昆仑山景观道设计为案例,梳理其资源(R)、市场(M)、主题(T)、旅游产品(P)及文化元素(E)之间的关系,展示RMTPE理论的应用方法,重点描述了地域文化的载体——文化元素(E)提取、物化及展示的过程,以期为文化元素在景区规划中的应用提供一种科学的思路与方法.  相似文献   

Spatial distribution and source diagnosis of polycyclic aromatic hydrocarbons in soils from Chengdu Economic Region,Sichuan Province,western China     

Xinli Xing  Shihua Qi  Jiaquan Zhang  Chenxi Wu  Yuan Zhang  Dan Yang  Joshua Owago Odhiambo 《Journal of Geochemical Exploration》2011

Surface soils from the Chengdu Economic Region (CER) were analyzed for sixteen United States Environment Protection Agency priority polycyclic aromatic hydrocarbons (PAHs) to study the spatial distribution and to identify the sources of PAHs. Relatively high concentrations (more than 1500 ngg^− 1) of high molecular weight PAHs were found in Chengdu Plain, in the middle of CER, while high concentrations (more than 500 ng g^− 1) of low molecular weight PAHs were detected in the surrounding mountains. The concentrations of ∑₁₆-PAHs in topsoil samples from CER (12.52–75,431.47 ngg^− 1, average value was 3233.92 ngg^− 1) were higher than that from the southern China (21.91–3077 ngg^− 1, average value was less than 500 ngg^− 1), and they were comparable to concentrations in soils from the northern China (366–254,080 ngg^− 1, mean value was more than 3000 ngg^− 1). The concentrations from CER were also much higher than the concentrations of some world clean regions such as Antarctic (34.9–171 ngg^− 1), European high mountains (9–11,000 ngg^− 1, mean value was 158 ngg^− 1) and some Europe residential (736 ngg^− 1) and arable soils (60–145 ngg^− 1, mean value was 66 ngg^− 1). The ratio of tracer compounds (BaA/(BaA + Chr), Flo/(Flo + Pyr), and IcdP/(IcdP + BghiP)) indicated that the high concentrations of PAHs in soils were mainly derived from fossil fuels combustion in mountain region and from the incomplete combustion of petroleum in developed plain area (such as Chengdu and Deyang). From the above distribution characteristics and ratios of tracer compounds, we inferred the reasons for the distribution pattern of PAHs in CER were the domestic heating, emissions, and the physicochemical properties of PAHs.  相似文献   

Modelling the impacts of cropland displacement on potential cereal production with four levels of China’s administrative boundaries     

YANG Bohan  SHENG Siyu  KE Xinli  DAI Xianhua  LU Xinhai 《地理学报(英文版)》2023,33(1):18-36

Cropland displacement, as an important characteristic of cropland change, places more emphasis on changes in spatial location than on quantity. The effects of cropland displacement on global and regional food production are of general concern in the context of urban expansion. Few studies have explored scale-effects, however, where cropland is displaced not only within, but also outside, the administrative boundary of a certain region. This study used a spatially explicit model (LANDSCAPE) to simulate the potential cropland displacement caused by urban land expansion from 2020 to 2040 at four scales of the Chinese administration system (national, provincial, municipal, and county levels). The corresponding changes in potential cereal production were then assessed by combining cereal productivity data. The results show that 4700 km² of cropland will be occupied by urban expansion by 2040, and the same amount of cropland will be supplemented by forest, grassland, wetland, and unused land. The potential loss of cropland will result in the loss of 3.838×10⁶ tons of cereal production, and the additional cropland will bring 3.546×10⁶ tons, 3.831×10⁶ tons, 3.836×10⁶ tons, and 3.528×10⁶ tons of potential cereal production in SN (national scale), SP (provincial scale), SM (municipal scale), and SC (county scale), respectively. Both SN and SC are observed to make a huge difference in cereal productivity between the lost and the supplemented cropland. We suggest that China should focus on the spatial allocation of cropland during large-scale displacement, especially at the national level.  相似文献   

关于GPS卫星定位中相对论效应修正的探讨     

周新力 《测绘信息与工程》2013,38(1):27-29,33

对GPS卫星定位中相对论效应的修正,若以GPS卫星信号在空间里实际传播的几何距离为最终的判断标准,则可以不依据爱因斯坦的广义和狭义相对论而直接达到这个目的;不仅如此,按照这个标准同时还包括消除了地球自转和GPS卫星的Sagnac效应的影响。  相似文献   

Application of back-propagation neural network on bank destruction forecasting for accumulative landslides in the three Gorges Reservoir Region,China   总被引：3，自引：2，他引：1  

Changdong Li  Huiming Tang  Yunfeng Ge  Xinli Hu  Liangqing Wang 《Stochastic Environmental Research and Risk Assessment (SERRA)》2014,28(6):1465-1477

In recent years, a large number of bank destruction occur in the reservoir area under the effect of water fluctuation, which may be lead to reservoir accumulative landslide geological hazards finally. The paper conducted the bank destruction forecasting study for accumulative landslides in the Three Gorges Reservoir Region, China utilizing back-propagation (BP) neural network approach. A representative scenario of Jinle landslide is then taken for analysis purposes. On the basis of the existing data sets of bank destruction cases, the BP neural network forecasting model and the corresponding programs for bank destruction are both presented, whose forecasting result is validated by two independent approaches, namely empirical method and numerical modeling method. Furthermore, the BP neural network model had obvious advantages over the convention approaches in the aspects of the fast calculation speed and high convenience. According to the bank destruction forecasting scale presented above, the corresponding revetment measures can be proposed to prevent the occurring of the bank destruction, whose effectiveness has been further validated by the actual engineering practice.  相似文献   

商城县茶叶气候生态适应性分析   总被引：2，自引：1，他引：1  

赵豫  尚新利  赵萍  王金海  翟安国  柳士伟  赵辉 《气象与环境科学》2008,31(Z1)

为扩大商城县茶叶种植面积,提高茶叶产量,根据茶叶生长发育与气候条件--光、热、水的关系,利用商城县气象局50年的气候观测资料,分析了春、夏、秋季(3-11月)的气温、降水、日照特点和灾害性天气对茶叶生长的影响,结果表明,商城县的气候条件--温度、降水、光照适应茶叶生长,虽然会出现对茶叶生长不利的春季低温、夏季高温和干旱天气,但出现几率较小,影响不大,具有大力发展茶叶产业的气候优势.同时提出了茶叶高产对策.  相似文献   

沿煤层定向钻进技术的研究     

周新莉  胡少韵 《煤田地质与勘探》1995,23(6):30-34

首次在煤矿井下使用组合钻具，螺杆钻具和绳钻钻具，调整钻进工艺参数，成功地解决了沿煤层定向钻进工艺的技术难题，在中厚缓倾斜煤层中沿煤层定向钻进，总进尺２２１３．５６ｍ，最大孔深达３０２ｍ，取得了明显的经济效益。  相似文献   

植被微气象的数值模拟     

王信理  熊文愈 《气象学报》1995,53(2):217-224

综合考虑梯度输送和阵性穿透作用，并对植被上方的过渡层作适当处理，提出了植被微气象的一阶闭合模型。它对温、湿、风等物理量垂直分布的模拟精度良好。引用系统优化理论和方法，对模型中参数作多维非线性搜索，结果客观可靠。由于植物本身的调节适应能力和反馈作用，大气与植被间的动量与水热交换机制和过程不尽相同。在动量输送过程中，梯度产生项和阵性穿透皆不可忽视，尤其在群体下部，更为重要；而在热量和水分输送过程中，阵性穿透作用在低矮密集植被中的贡献甚微，梯度产生项起主导作用。  相似文献   

Field monitoring and deformation characteristics of a landslide with piles in the Three Gorges Reservoir area   总被引：1，自引：0，他引：1  

Yuming Zhang  Xinli Hu  Dwayne D. Tannant  Guangcheng Zhang  Fulin Tan 《Landslides》2018,15(3):581-592

Landslides often occur within the reservoir area behind dams. In China, a common strategy for stabilizing these landslides is to install large piles through the landslide and into the stable ground below. The piles interact with the landslide and constitute a landslide-stabilizing pile system. The deformation of this system under the reservoir operation is more complicated than the deformation of the landslide itself. Understanding the behaviour of this system is very important to the long-term safety of landslides stabilized with piles in reservoirs. The Majiagou landslide, which was selected as a case study, was triggered by the first impoundment of the reservoir behind the Three Gorges dam. A row of anti-slide piles was installed in the landslide in 2007, but monitoring results found these were ineffective at stabilizing the landslide. Subsequently, in 2011, two longer test piles and an integrated monitoring system were installed in the landslide to better understand the failure mode of the landslide and to measure the deformation characteristics of the landslide-stabilizing pile system. Monitoring results show that the Majiagou landslide is a translational landslide with three slip surfaces. The test piles provided local resistance and partially slowed down the sliding mass behind the piles, and the landslide deformation response to external factors decreased for a time. However, after 2 years, the deformation of the landslide-stabilizing pile system reverted to seasonal stepwise cumulative displacements influenced by cycles of reservoir drawdown and rainfall. The monitoring results provide fundamental data for evaluating the long-term performance of anti-slide piles and for assessing long-term stability of the stabilized landslide under the reservoir operation.  相似文献