Guidelines to locate and protect high-quality groundwater in Baiyu Mountain area of China   总被引：1，自引：0，他引：1  

Yunfeng Li  Zhonghua Xu  Jiangxia Wang  Yaoguo Wu  Guangcai Hou 《Environmental Geology》2005,47(5):647-652

The Baiyu Mountain area has the most shortage of water in the Ordos Basin of China. The majority of the groundwater is in the Luohe water-bearing formation, which is characterized by high total dissolved solids (TDS). The concentration of TDS can be as high as 10.45 g/l, which makes the water unsuitable for either potable or irrigation purpose. The dominant ions in the groundwater are SO^2–₄·Cl^–. The maximum concentrations of SO^2–₄ and Cl^– are 3,170 and 3,830 mg/l, respectively. The areas with low TDS groundwater are in Jingbian and Zhidan counties. However, nitrogen pollution caused by human and agriculture activities is a significant threat to the protection of fresh water in these counties.  相似文献   

跨国企业投资的区位行为与企业空间组织联系特征：以在华投资的日资 …   总被引：5，自引：0，他引：5  

张文忠  庞效民 《地理科学》2000,20(1):7-13

从经济区位论角度出发,立足于实际考察、问卷调查和大量中外统计资料的分析基础上,以日资和韩资企业在华投资为例,研究了跨国企业在华投资的区位行为、投资模式和企业的窨组织联系特征。  相似文献   

农用地定级系统开发中对区位因素定量化的思考     

雷少刚  黄继辉 《国土资源信息化》2005,18(4):45-48

本文介绍了目前农用地定级工作中区位因素定量化处理的一般方法。针对目前区位因素定量化过程中存在的问题,如空间距离量算、阻隔与通道、衰减模型、定级区域外的区位因素等,提出了相应的改进措施,以使定级结果尽可能的符合现实。  相似文献   

基于GIS的牡丹江市主城区建设用地适宜性评价     

王建伟  陈桂虎  宋立东  宋林旭  佟智强  高博 《地质与资源》2021,30(4):499-504

根据研究区内地质环境特征,选取地貌类型、地面坡度、地下水位埋深、地下水腐蚀性、地基承载力、土体压缩模量和地质灾害易发性7个评价指标,利用层次分析法（AHP）和GIS空间分析对主城区建设用地适宜性进行了评价分析.结果表明,牡丹江市主城区建设用地适宜性良好,适宜区和较适宜区占主城区总面积的58.2%,并以主城区南部区域地质环境最为优越,建议牡丹江市适度向南发展,同时做好生态环境和永久基本农田的保护工作.  相似文献   

基于GIS-FAHP的石家庄市地下水源热泵适宜性分区     

闫佰忠  孙剑  王昕洲  李晓萌  孙丰博  付丹平 《吉林大学学报(地球科学版)》2021,51(4):1172-1181

为探明石家庄城区地下水源热泵适宜区分布情况,基于石家庄市的地质、水文地质和环境地质条件构建了地下水源热泵适宜性评价指标体系,包括水文地质条件、水动力条件、水化学条件、环境地质条件和先决条件;利用模糊层次分析法确定了评价指标综合权重,并结合GIS空间分析功能划分了石家庄城区地下水源热泵适宜性分区。结果表明：研究区地下水水源热泵开发利用适宜区分布在靠近滹沱河地区,面积约为19.74 km²,占全区面积的5.85%;较适宜区分布于研究区大部分,面积约为251.22 km²,占全区面积的74.40%;不适宜区主要分布在研究区西北部及东部地下水超采漏斗区,面积约为66.71 km²,占全区面积的19.75%。石家庄市除地下水降落漏斗区及水文地质条件较差地区不适宜作为地下水源热泵开发的地区外,大部分地区较适合利用地下水源热泵技术。  相似文献   

江油市青莲镇规划应急水源地分析与评价          下载免费PDF全文

孙金辉  谢忠胜  韩新强 《探矿工程》2018,45(8):136-140

涪江作为江油市重要饮用水来源,在遭受上游水污染发生后,需要及时更换应急水源地供水,结合流域特点,选址青莲镇作为江油市应急水源地。通过调查研究青莲镇地下水资源量,全面研究了该地区地下水补给量、储存量和消耗量,并采集水源地水样进行实验分析,获取水源地水化学特征,研究结果显示青莲镇地下水水量、水质满足江油市应急水源地要求,最后利用层次分析法对江油市应急水源地进行了适宜性评价。  相似文献   

Reconsidering the Suitability Assessment Method for Glacier Tourism: A Case Study from Tibet,China     

YU Hu  XU Linlin  LIU Limin 《资源与生态学报(英文版)》2022,13(4):687-696

Glacier retreat is becoming more widespread and severe due to global warming, and improper exploitation of glacier resources by tourism activities accelerates the destruction of glacier landscapes. Therefore, establishing a set of quantitative assessment tools is critical for guiding the rational utilization of glacier tourism resources. This study selected regional tourism resources, the natural environment of glaciers, service support, and market demand factors to build a suitability assessment method for glacier tourism (SAMGT), and it used the Delphi and Analytic Hierarchy Process (AHP) to determine the index weights, and combined them with GIS analysis technology. The Tibet autonomous region was proposed in this study as a case to build the SAMGT and provide scientific support for the rational development, scientific management, and sustainable development of glacier tourism resources. With regard to influencing the suitability of glacier tourism resource development, the results indicate that the weights of glacier resource endowment, ecological vulnerability, and tourism resource combination were high whereas that of market demand-related factors was low. The glacier tourism resource development area in Tibet can be divided into suitable, relatively suitable, barely suitable, and unsuitable exploitation zones, accounting for 5.39%, 9.76%, 15.28%, and 69.57% of the total area, respectively. Five representative glaciers were selected to verify the validity or test the rationality of SAMGT and prove that the model is reasonable, innovative, and effective from the perspectives of multiple dimensions and the comprehensiveness of the selected indicators.  相似文献   

Intelligent Identification of Building Patches and Assessment of Roof Greening Suitability in High-density Urban Areas: A Case Study of Chengdu     

LUO Luhua  CHEN Mingjie  DONG Lulu  SU Wei  LI Xin  HU Xiaodong  ZHANG Xin  LI Chen  CHENG Weiming  SHI Hanning  LUO Jiancheng 《资源与生态学报(英文版)》2022,13(2):247-256

With the expansion of a city, the urban green space is occupied and the urban heat island effect is serious. Greening the roof surfaces of urban buildings is an effective way to increase the area of urban green space and improve the urban ecological environment. To provide effective data support for urban green space planning, this paper used high-resolution images to (1) obtain accurate building spots on the map of the study area through deep learning assisted manual correction; and (2) establish an evaluation index system of roof greening including the characteristics of the roof itself, the natural environment and the human society environment. The weight values of attributes not related to the roof itself were calculated by Analytic Hierarchy Process (AHP). The suitable green roof locations were evaluated by spatial join, weighted superposition and other spatial analysis methods. Taking the areas within the Chengdu city’s third ring road as the study area, the results show that an accurate building pattern obtained by deep learning greatly improves the efficiency of the experiment. The roof surfaces unsuitable for greening can be effectively classified by the method of feature extraction, with an accuracy of 86.58%. The roofs suitable for greening account for 48.08%, among which, the high-suitability roofs, medium-suitability roofs and low-suitability roofs represent 45.32%, 38.95% and 15.73%. The high-suitability green buildings are mainly distributed in the first ring district and the western area outside the first ring district in Chengdu. This paper is useful for solving the current problem of the more saturated high-density urban area and allowing the expansion of the urban ecological environment.  相似文献   

一种基于Harris角点检测的SVG转换可视化效果评价方法     

王艳慧  李跃 《地球信息科学学报》2014,(3):368-375

SVG作为移动互联时代获得各种丰富图形信息的有效表达方法,已成为LBS中空间信息表达与描述的热点应用之一,但目前的研究大多没有考虑多源数据格式向SVG格式转换后的图像质量评价问题。针对多源空间数据向SVG格式转换方法和转换效果评价技术,本文设计了栅格数据和矢量数据向SVG格式转换的表达方法,分别利用直接载入栅格图像和编程实现矢量数据转换的方法实现了多源空间数据向SVG格式的有效转换;从定性与定量相结合的角度分析了转换前后的图像质量,设计了角点检测评价指标和流程,提出了基于Harris角点检测的SVG转换前后图形几何质量的评价方法。实验证明:SVG格式比较适用于位置服务中对空间数据尤其是矢量数据的表达,经过SVG转换后的图像,无论是栅格数据还是矢量数据都具有较高的图像质量,且栅格数据的转换效果相对略差于矢量数据;验证了一种基于SVG的移动位置空间服务信息表达和组织模式,对普及和强化SVG在位置服务系统中的应用具有一定的推动作用。  相似文献   

河南省夏玉米气候适宜度评价   总被引：3，自引：0，他引：3  

李树岩  陈怀亮 《干旱气象》2014,(5):751-759

为定量评价气象条件对作物生长及产量形成的影响,本文依据夏玉米不同发育阶段上限温度、最适温度、下限温度、需水量、需光性等生物学指标,构建了河南省夏玉米气候适宜度评价模型。通过对13个代表站30 a全生育期气候适宜度和相对气象产量进行相关分析,表明该模型能较好地反映河南省夏玉米的气候适宜水平及其动态变化。利用检验后的模型计算了河南省67个站1981-2011年夏玉米生长季单因子及综合气候适宜度,结果表明河南省夏玉米大部分生育期光热资源较适宜,能满足玉米生长所需,仅在灌浆后期略显不足,降水是影响夏玉米产量形成的主要限制因子,且降水适宜度年际变化幅度大于日照和温度。综合气候适宜度年际波动表现为抽雄—乳熟期〉出苗—抽雄期〉全生育期。空间分布上气候适宜度呈自西北向东南方向的递增趋势,适宜度高值区分布在南阳东部及驻马店部分地区。  相似文献