福建温泉的特点及其热源,成因的探讨   总被引：3，自引：0，他引：3  

何永金  陈明光 《福建地质》1999,18(3):149-155

主要介绍了福建温泉的水温,水量,水质,水热异常区大小,空间分布以及产出的地质,地貌的特点,对福建温泉的主要热源观点进行讨论,并对福建温泉的热源,成因和温泉的构造意义提出了初步的想法。  相似文献   

岩湾矿段风化磷矿形成条件及其三种类型     

陈拥军 《化工矿产地质》1999,21(4):225-230

湖北省鹤峰磷矿走马矿区岩湾矿段风化磷矿是湖北境内首次探明的一中型风化磷矿。矿床成因类型有风化残余型、风化淋滤型、洪积型砂磷矿等三类。在时间上 ,风化淋积型矿体位于风化残余型矿体之下 ,是风化残余型的继承发展。在雨水和洪水冲刷下 ,风化残余磷矿在适当的低洼地带堆积成洪积型砂磷矿。对这种风化矿的勘探应因地制宜 ,灵活运用。对岩湾矿段风化磷矿的成因探讨和勘探研究为东山峰寻找和勘探类似风化磷矿积累了经验。  相似文献   

磁偏角（D）的数据处理   总被引：2，自引：0，他引：2  

史勇军  孙燕萍 《内陆地震》1999,13(1):84-87

磁偏角观测数据既有东西方向的区别,又有数值大小的变化,由于喀仁台所处的地理纬度,其磁偏角方向偏东,观测工作就是要搞清磁照图上Ｄ与ＤＢ相对位置及Ｄ↑及Ｄ↓的物理意义;箭头表示磁场变化的向东偏的方向。在处理Ｄ观测数据时很容易发生混乱的错误,针对存在的问题,对数据处理展示了讨论。  相似文献   

基于二次曲面的Shepard方法在GPS高程拟合中的应用   总被引：1，自引：1，他引：0  

黄勇军 《地理空间信息》2010,8(1):32-34

针对单一GPS高程拟合方法的不足,给出了一种基于二次曲面的Shepard拟合法。通过对二次曲面拟合法、Shepard拟合法和基于二次曲面的Shepard拟合法进行高程拟合结果的比较,表明基于二次曲面的Shepard拟合方法能显著提高高程拟合精度。  相似文献   

缩短核磁共振测定冻土未冻水含量实验时间的方法     

李东阳  刘波  刘念  马永君  王莉 《冰川冻土》2014,36(6):1502-1507

为利用核磁共振(NMR)技术更快地测试得到冻土中未冻水的含量, 首先对传统的单试样测试方法进行了分析, 探究了其实验时间过长的原因. 然后, 基于传热学中的集总参数法, 研究了小体积试样在空气中以自然对流传热为冷却方式的温度变化特征. 根据试样温度与时间的对应关系, 提出了多试样连续测试法. 最后, 以一种黏土为例, 分别利用多试样连续测试法和单试样测试法测量了土样冻结过程中NMR信号强度随温度变化的关系. 实验结果表明: 二者的测量结果非常接近, 但连续测试法耗费的时间非常少. 综合比较两种利用NMR技术所耗费的时间和实验结果的精确程度, 多试样连续测试法是可行的.  相似文献   

Spatio-temporal distribution of Konosirus punctatus spawning and nursing ground in the South Yellow Sea     

Xiangyu Long  Rong Wan  Zengguang Li  Yiping Ren  Pengbo Song  Yongjun Tian  Binduo Xu  Ying Xue 《海洋学报(英文版)》2021,40(8):133-144

In recent years, Konosirus punctatus has accounted for a large portion in catch composition and become important economic species in the South Yellow Sea. However, the distribution of K. punctatus early life stages is still poorly understood. In this study, generalized additive models with Tweedie distribution were used to analyze the relationships between K. punctatus ichthyoplankton and environmental factors(longitude and latitude, sea surface temperature(SST), sea surface salinity(SSS) and depth), and predict distribution K. punctatus spawning ground and nursing ground, based on samplings collected in 6 months during 2014–2017. The results showed that K. punctatus' spawning ground were mainly distributed in central and north study area(from 33.0°N to 37.0°N).By comparison, the nursing ground shifted southward, which were approximately located along central and south coast of study area(from 31.7°N to 35.5°N). The optimal models identified that suitable SST, SSS and depth for eggs were 19–26°C, 25–30 and 9–23 m, respectively. The suitable SSS for larvae were 29–31. The K. punctatus spawning habit might have changed in the past decades, which was a response to increasing SST and fishing pressure. That needs to be proved in further study. The study provides references of conservation and exploitation for K. punctatus.  相似文献   

黄河龙头水库来水量的年代际变化及年度预测方法          下载免费PDF全文

汤懋苍  张拥军  李栋梁 《气候变化研究进展》2005,1(3):129-132

根据1736-2004年近270 a来的代用资料和实测资料,对唐乃亥水文站逐年来水量划分为9个丰水年段,8个枯水年段。在同时段的太阳黑子周期长度（SCL）资料中,找到9个SCL的极长点,8个SCL的极短点,发现SCL的极长（短）点都出现在丰（枯）水年段之中或超前1～2 a。这为黄河源区丰、枯水段的预测找到了一个比较好的指标。最后,从"宇地磁耦合假说"出发,解释其关系密切的物理原因。  相似文献   

近50年中国冬季大地冷涡与春夏季干旱相关的统计   总被引：2，自引：1，他引：1  

汤懋苍  张拥军  李栋梁 《气象学报》2005,63(6):1006-1009

通过对冬季大地冷涡与春夏季干旱的相关分析,发现:除高原主体外,冬季的大地冷涡对应着春夏季为干旱少雨区;而且大地冷涡东面的地冷涡绝大多数也是春夏季的干旱少雨区。冬季大地冷涡在中国的出现频率为80%,可作为短期气候预测的重要因子。  相似文献   

Evaluating the relationship between spatial heterogeneity and temporal variability of larval fish assemblages in a coastal marine ecosystem (Haizhou Bay,China)   总被引：1，自引：0，他引：1       下载免费PDF全文

Zengguang Li  Zhenjiang Ye  Rong Wan  Yong Chen  Yongjun Tian  Yiping Ren  Hong Liu  Haisheng Hu  Robert Boenish 《Marine Ecology》2017,38(6)

In coastal marine ecosystems, spatial patterns of larval fish assemblages (LFAs) tend to exhibit geographic stability because of relatively stable spawning site selection and predictable oceanographic phenomena such as eddies. To evaluate the relationship between spatial heterogeneity and temporal variability of LFAs, we conducted a high spatiotemporal resolution ichthyoplankton survey from April to July in 2013 in the shallow waters (<20 m) of Haizhou Bay, China. Our analysis indicated three distinct assemblages, which were stable geographically but exhibited a gradual and directional change of species composition and abundance over our study period. Sea surface temperature was the most important environmental co‐variate for determining temporal variability of LFAs, likely owing to temperature effects of species composition and spawning period selection of adult fish, along with known temperature‐dependent survival rates of larval fish. Study of LFA spatiotemporal dynamics is essential for improved understanding of adult fish spawning behavior, and has potential to inform design and implementation of conservation and management measures (e.g. marine protected areas) in coastal systems.  相似文献   

The Implementation Effects of a Nationwide Sloping Farmland Soil Erosion Control Project in China     

FENG Wei  YANG Yunfen  ZHAO Yongjun  DI Baofeng  MA Changchen 《资源与生态学报(英文版)》2017,8(4):341-351

To understand implementation of a nationwide sloping farmland soil erosion comprehensive control project during China’s 12^th Five-Year Plan we used data collection and expert consultation. We selected 24 indexes across three aspects including project management, engineering construction and implementation benefit and used AHP-grey correlation analysis methods. We found that the scores for engineering construction were greater than 0.65 in most of the provinces, autonomous regions and municipalities. These scores are high and scores for project management and implementation benefit are between 0.45-0.65; however, overall scores are low. The comprehensive evaluation results are normally distributed. The composite scores for Sichuan, Yunnan and Guizhou are 0.71, 0.68 and 0.68 respectively, indicating that the implementation effects are good. The scores for Jilin and Liaoning are 0.38 and 0.42 respectively, indicating that the implementation effects need improvement. Scores for other provinces are between 0.45-0.65 and the effects are medium. The evaluation results show certain zonal rules spatially and the implementation effect in karst regions of Southwest China is the highest, followed by the purple soil region in Southwest China, Loess Plateau region of Northwest China, earth-rock mountain region of North China and red soil hilly region of South China. The implementation effect in the black soil region of Northeast China suggests that improvement is needed in this region.  相似文献