甘肃北山—河西走廊—祁连山区域地下水循环模式     

董艳辉  符韵梅  王礼恒  王驹  张倩  宗自华  周志超 《地质科技情报》2022,41(1):79-89

山区地下水流动受到区域气候条件、地形地貌、地质构造等因素共同控制,限于资料有限,其流动模式与控制机理尚不清晰.特别是地处甘肃北山的高放废物地质处置库预选区、河西走廊以及祁连山北麓区域地下水的流动模式,直接决定了处置库在万年时间尺度上的安全性.基于区域遥感构造解译、地质构造演化分析、地球物理勘探以及水文地质钻探,获取了典...  相似文献   

近百年来东平湖沉积通量变化与环境   总被引：5，自引：0，他引：5  

陈影影  陈诗越  姚敏  刘加珍  张菊 《沉积学报》2010,28(4):783-789

根据210Pb、137Cs法建立的东平湖现代沉积年代序列,结合沉积物粒度与烧失量变化特征以及黄河变迁与流域人类活动的特点,分析探讨了1889年以来东平湖沉积通量的变化。研究表明,百年来东平湖沉积环境不稳定,沉积通量变化较大:1889~1938年,沉积通量较高且基本稳定,1938~1965年,沉积通量逐年下降,1965~2000年,沉积通量整体较低且基本稳定,2000年以来,沉积通量呈逐年上升趋势。早期的高沉积通量与东平湖作为黄河自然滞蓄洪区有关,后期由于人类活动（湖区治理、黄河水利工程建设等）控制了黄河水的自然倒灌,导致了沉积通量的下降并趋于稳定,近期沉积通量的上升是湖区经济活动增强的反映。  相似文献   

高放废物处置库甘肃北山预选区地下水位动态特征   总被引：2，自引：0，他引：2  

郭永海  王驹  王志明  肖丰  刘淑芬  苏锐  宗自华  李亚伟 《铀矿地质》2010,26(1):46-50,59

阐明了甘肃北山预选区地下水位动态特征及其与当地大气降水的关系,并对其动态类型进行了剖析,由此得出北山地区地下水源自当地大气降水补给的认识。为处置库预选区场址评价提供了水文地质依据。  相似文献   

A comparison of different Gracilariopsis lemaneiformis (Rhodophyta) parts in biochemical characteristics,protoplast formation and regeneration     

Zhongxia Wang  Zhenghong Sui  Yiyi Hu  Si Zhang  Yulong Pan  Hongri Ju 《中国海洋大学学报(英文版)》2014,13(4):671-676

Gracilariopsis lemaneiformis is a commercially exploited alga. Its filaceous thallus can be divided into three parts, holdfast, middle segment and tip. The growth and branch forming trend and agar content of these three parts were analyzed, respectively, in this study. The results showed that the tip had the highest growth rate and branched most, although it was the last part with branch forming ability. The holdfast formed branches earliest but slowly. Holdfast had the highest agar content. We also assessed the difference in protoplast formation and regeneration among three parts. The middle segment displayed the shortest enzymolysis time and the highest protoplast yield; whereas the tip had the strongest vitality of protoplasts formation. Juvenile plants were only obtained from the protoplasts generated from the tip. These results suggested that the differentiation and function of G. lemaneiformis was different.  相似文献   

Changes in Land Use and Agricultural Production Structure Before and After the Implementation of Grain for Green Program in Western China–Taking Two Typical Counties as Examples   总被引：1，自引：1，他引：0  

ZHOU Ping  WEN An-bang  YAN Dong-chun  SHI Zhong-lin  GUO Jin  JU Zhan-sheng  ZHANG Yi-lan 《山地科学学报》2014,11(2):526-534

Soil erosion becomes a serious environmental problem in the world, especially in western China. An effective management practice called the Grain for Green Program （GGP）, which was launched in 1999, aims to reduce soil and water loss and alleviate the ecological environment problem in western China. Two typical counties in western China, the Zhongxian （in Chongqing Municipality） and Ansai （in Shaanxi Province） were chosen to evaluate the dynamic changes of land use and agricultural production structure before and after the implementation of the Program in this paper. The results showed that the cultivated land area was reduced by 7.08% from 1989 to 2003. The cultivated land per person was decreased by 8.42% during 1999-2003. Moreover, the stability index of the secondary sector of the economy was increased from 0.91 in the period 1990-1999 to 0.94 in the following ten years. In addition, the stability index of tertiary economic sector increased from 0.88 to 0.92 in Zhongxian county. Meanwhile, the cultivated land area was reduced by 15.48% from 1990 to 1999. The soil erosion modulus was decreased by 33.33% from 1999 to 2006. Also, the stability index of secondary and tertiary economic sectors was 0.86 in the period 1998-2002. However, it decreased by 77% during 2002 to 2007 in Ansai County. These results imply that the Grain for Green Program had different impact on the two regions. Several effective strategies of soil and water conservation have been carried out to ameliorate the sustainable development of ecological environment and economy in these two counties of western China.  相似文献   

时空遥感云计算平台PIE-Engine Studio的研究与应用   总被引：1，自引：0，他引：1  

程伟  钱晓明  李世卫  马海波  刘东升  刘富乾  梁军龙  胡举 《遥感学报》2022,26(2):335-347

随着遥感大数据时代的到来,为快速处理和分析海量遥感数据,国内外涌现了众多遥感云计算平台,使得全球尺度、长时间序列遥感数据的快速分析和应用成为可能。本文在分析国内外遥感云计算平台现状的基础上,针对大数据时代国内缺少功能完备的遥感云计算平台,且国外遥感云计算平台对国产卫星数据支持不足等问题,基于容器云技术,构建了包含国产卫星数据且集数据、算力和技术于一体的时空遥感云计算平台PIE（Pixel Information Expert）-Engine Studio,实现了脚本驱动的遥感数据的按需获取以及海量数据的快速处理。采用Landsat 8数据,以生长季植被指数NDVI（Normalized Difference Vegetation Index）的计算为例,对比了本平台与GEE（Google Earth Engine）的数据处理能力。结果表明,由于计算资源的限制,本平台的计算和导出时间均比GEE稍长,但计算结果的空间分布一致,其中近68%的值均分布在（0.48,0.77）,且二者差值的95.33%集中在（-0.13,0.13）,结果较为可信。因此,本文构建的基于共享、开放的中国自主遥感云计算平台PIE-Engine Studio,可为地球科学领域的研究提供数据和算力支持,将有助于推进中国遥感云计算平台的发展进程,推动国产卫星数据在云计算平台上的应用。  相似文献   

高放废物地质处置北山预选区旧井和新场花岗岩填隙方解石同位素地球化学     

田霄  王驹  金远新 《铀矿地质》2014,(1):23-29

为了探讨高放废物地质处置甘肃北山预选区旧井和新场预选地段的古地下流体来源、成因、化学演化历史以及水-岩相互作用,文章系统研究了该地段花岗岩填隙方解石的产出特征及其碳、氧、锶同位素的组成特征。测试结果表明,旧井和新场方解石的δ13 C组成均较稳定且为负值(分别为-11.6‰~-5.7‰和-9.9‰~-5.1‰);δ18 O分别为-0.7‰~19.7‰和10.9‰~21.9‰,旧井方解石具有更宽的δ18 O取值范围。87 Sr/86 Sr也略有差异,旧井为0.708584~0.718749,新场为0.708838~0.732967,二者随深度增加而呈明显的降低趋势。研究表明,北山预选区地下流体来源及成因较复杂,浅部地下水受大气降水的影响较大,深部流体则主要源于地下咸水,为低温流体蚀变成因。花岗岩裂隙中的水-岩反应强度总体较弱,地下水环境相对稳定。相比较而言,新场岩体深部的地球化学环境更稳定,更有利于高放废物的长期处置。  相似文献   

Emergency alternative evaluation and selection based on ANP,DEMATEL, and TL-TOPSIS     

Ju  Yanbing  Wang  Aihua  You  Tianhui 《Natural Hazards》2014,75(2):347-379

With the increasing occurrence frequency of emergency events, emergency management (EM) has been a very important issue in management science. One of the major activities of EM is to evaluate and select the most desirable emergency alternative(s). This paper proposes a new framework combining the analytic network process (ANP) method, the decision-making trial and evaluation laboratory (DEMATEL) technique, and 2-tuple linguistic technique for order preference by similarity to an ideal solution (TL-TOPSIS) method to solve the emergency alternative evaluation and selection problem. This study has been done in three stages. In the first stage, we use DEMATEL technique to obtain the network relation map (NRM) among emergency alternative evaluation criteria or sub-criteria. In the second stage, we use ANP method to calculate the global weight of each sub-criterion based on the NRM among emergency alternative evaluation sub-criteria. In the third stage, the ratings of emergency alternative with respect to each sub-criterion are described by linguistic items, and the TL-TOPSIS method is used to rank the emergency alternative. Finally, a practical example of urban fire emergency alternative selection is given to illustrate the application of the proposed framework.

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双循环新格局下重庆市城镇化发展动力与实现路径     

孙平军  罗宁  刘菊  彭雅丽 《热带地理》2022,42(11):1816-1828

源于时代之变而构筑的双循环新发展格局是市场经济条件下多尺度空间输出理论与劳动地域大分工的“叠加”,为新型城镇化发展带来新的动力源泉。为了揭示这种影响,首先将科技创新和制度改革这2个城镇化发展动力外生变量内生化,构建基于“四维驱动力模型+创新力+制度力”的城镇化动力因子分析框架,结合主成分回归模型对2000年以来重庆市城镇化发展动力进行分析,并据此引入波特的“钻石模型”对其城镇化发展路径进行系统思考。结果表明：1）纳入动力因子体系的创新力和制度力对重庆市城镇化发展产生显著的正向驱动效应,其中创新力表现最为明显。2）重庆市城镇化发展是“六维力”共同作用的结果,但市场力和行政力依然是最主要的驱动力;其次是创新力、内源力和外向力,其中创新力对城镇化发展的驱动效应已在阶段2（2010—2018年）超越行政力的作用效应;最后是制度力;间接反映重庆市城镇化本身是一个内生作用的过程,构筑“以国内大循环为主体、国内国际双循环相互促进”新发展格局具有客观必然性和前瞻性。3）基于波特“钻石模型”分析指出：重庆市存在增长极体量小、市场购买力不足、产品低端化、同质化现象严重等问题,并据此从发展高级生产要素、创造统一的要素自由流动市场,通过“扩内需、调结构、深化对外开放”扩大市场需求,促进城市发展,培育与发展主导产业及其配套产业,抓住机遇“走出去”和建设高质量的服务型政府6个维度对其城镇化高质量发展的实现路径展开具体对策与建议的思考。  相似文献   

城市收缩研究进展及其中国本土化思考     

刘菊  孙平军  罗宁  彭雅丽 《地域研究与开发》2022,41(3):55-60

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