基于SWDC-4的1∶10000基础测绘数据更新     

孙铁军 《测绘科学》2012,(1):171-173

SWDC-4数码航测相机填补了国产数字航测仪相机的空白,与国外UCD、DMC等相机相比具有众多优势,更适用于1∶10 000基础测绘数据更新。本文介绍了SWDC-4在邵阳基础测绘数据更新项目中的作业流程和技术设计过程,统计分析了空三加密和最终DLG产品的精度,为SWDC-4在其他基础测绘数据更新项目中的应用提供了借鉴。  相似文献   

三江源区径流演变及其对气候变化的响应(英文)   总被引：2，自引：2，他引：0  

张永勇  张士锋  翟晓燕  夏军 《地理学报(英文版)》2012,22(5):781-794

Runoff at the three time scales(non-flooding season,flooding season and annual period) was simulated and tested from 1958 to 2005 at Tangnaihai(Yellow River Source Region:YeSR),Zhimenda(Yangtze River Source Region:YaSR) and Changdu(Lancang River Source Region:LcSR) by hydrological modeling,trend detection and comparative analysis.Also,future runoff variations from 2010 to 2039 at the three outlets were analyzed in A1B and B1 scenarios of CSIRO and NCAR climate model and the impact of climate change was tested.The results showed that the annual and non-flooding season runoff decreased significantly in YeSR,which decreased the water discharge to the midstream and downstream of the Yellow River,and intensified the water shortage in the Yellow River Basin,but the other two regions were not statistically significant in the last 48 years.Compared with the runoff in baseline(1990s),the runoff in YeSR would decrease in the following 30 years(2010-2039),especially in the non-flooding season.Thus the water shortage in the midstream and downstream of the Yellow River Basin would be serious continuously.The runoff in YaSR would increase,especially in the flooding season,thus the flood control situation would be severe.The runoff in LcSR would also be greater than the current runoff,and the annual and flooding season runoff would not change significantly,while the runoff variation in the non-flooding season is uncertain.It would increase significantly in the B1 scenario of CSIRO model but decrease significantly in B1 scenario of NCAR model.Furthermore,the most sensitive region to climate change is YaSR,followed by YeSR and LcSR.  相似文献   

北京市级湿地公园建设评估标准案例研究     

王义飞  朱利  崔丽娟  张曼胤  李胜男  赵欣胜  李伟  栾军伟 《湿地科学与管理》2012,8(3):19-22

以翠湖国家城市湿地公园为案例,对北京市级湿地公园评估标准进行了验证研究,结果表明:北京市级湿地公园评估标准简单易用、计算简便、可操作性强,能够科学准确并定量化地反映北京市级湿地公园的湿地特征,以及在建设、管理、维护和运营等方面的现状,可以用来指导北京市湿地公园科学有序地建设。  相似文献   

赤峰市松山区、翁牛特旗土壤墒情评估与预测     

尹清华  李俊有 《内蒙古气象》2009,(5):27-28

在重点分析评估赤峰市松山区、翁牛特旗历年春、夏、秋季土壤墒情变化规律基础上,利用数理统计方法。建立土壤墒情预测模型,为当地不同季节的农事活动提供土壤墒情依据,尽而为保证农业稳产高产提供气象参考依据。  相似文献   

滇东南铝的地球化学异常及资源预测     

范玉周  范礼刚  尹焕菊 《云南地质》2010,29(3):251-256

滇东南铝矿分原生沉积型和残、堆积型。区内地球化学反映较好。依据典型矿床地球化学、异常参数、矿床地质、储量等要素提取地球化学信息,确定地化异常,并对区内铝矿资源量进行预测。  相似文献   

安徽大别山(六安)国家地质公园地质遗迹成因及评价          下载免费PDF全文

张树萍  徐海霞 《地质找矿论丛》2010,25(1):82-87

安徽大别山(六安)国家地质公园是我国为数不多的集花岗岩地貌、变质岩地貌、火山岩地貌、构造地貌及丹霞地貌为一体的综合性地质公园区。通过野外实地调查,对公园的主要地质遗迹成因进行了探讨,并运用定性、定量相结合的评价方法,按照《旅游资源分类、调查与评价》中的相关规定对公园地质遗迹资源进行综合评价。  相似文献   

鸭河口水库流域高炮人工增雨试验效果评价   总被引：1，自引：0，他引：1  

李冰  冶林茂等 《河南气象》2001,(1):37-38

1998，1999年夏季在鸭河口水库流域进行了高炮人工增雨作业试验，结果表明，借助雷达引导，选择适当作业时机，高炮增雨作用一般可增雨20％－40％。  相似文献   

对荒漠化几个理论问题的初步探讨   总被引：22，自引：1，他引：21  

张宏  慈龙骏  孙保平 《地理科学》1999,19(5):446-450

讨论了荒漠化的概念和内涵,评价指标体系及发生机制等问题,认为联合图《防治荒漠化公约》中的荒漠化定义揭示了各类型荒漠化的共同本质,是较为科学和适用的定义,荒漠化评价指标的“基准”荒漠化气候类型及评价的空间尺度是建立荒漠化评价指标体系的关键,荒漠化的发生机制是荒漠化理论的核心,它涉及到荒漠化的反馈关系,荒漠化的非平衡过程及荒漠化与土地系统复杂性的关系,土地利用／土地覆被变化是荒漠化的驱动因素之一。  相似文献   

Communicating uncertainty: lessons learned and suggestions for climate change assessment     

Anthony Patt  Suraje Dessai 《Comptes Rendus Geoscience》2005,337(4):425-441

Assessments of climate change face the task of making information about uncertainty accessible and useful to decision-makers. The literature in behavior economics provides many examples of how people make decisions under conditions of uncertainty relying on inappropriate heuristics, leading to inconsistent and counterproductive choices. Modern risk communication practices recommend a number of methods to overcome these hurdles, which have been recommended for the Intergovernmental Panel on Climate Change (IPCC) assessment reports. This paper evaluates the success of the most recent IPCC approach to uncertainty communication, based on a controlled survey of climate change experts. Evaluating the results from the survey, and from a similar survey recently conducted among university students, the paper suggests that the most recent IPCC approach leaves open the possibility for biased and inconsistent responses to the information. The paper concludes by suggesting ways to improve the approach for future IPCC assessment reports. To cite this article: A. Patt, S. Dessai, C. R. Geoscience 337 (2005).  相似文献   

中国农业气候年景的评估及预测   总被引：5，自引：2，他引：5       下载免费PDF全文

孙家民  黄朝迎 《应用气象学报》2005,16(Z1):111-115

采用历年逐旬降水量距平绝对值累积值、负距平累积值、正距平累积值为指标 ,分别表示旱涝、干旱、洪涝程度 ,以此分别建立旱涝受 (成 )灾面积、干旱受 (成 )灾面积、洪涝受 (成 )灾面积与逐旬降水量距平绝对值累积值、负距平累积值、正距平累积值之间的回归评估模型。然后 ,利用百分位数方法 ,将受 (成 )灾面积分为 5级 ,进行农业气候年景旱涝评价。经历史回代检验和预报检验 ,效果较好。  相似文献