ICESat-2激光卫星与光学遥感影像融合水深测量          下载免费PDF全文

曹彬才  方勇  江振治  高力  胡海彦 《海洋测绘》2020,40(5):21-25

针对浅海测深的数据特点和应用需求,以我国南海甘泉岛为例,研究了利用ICESat-2(Ice,Cloud,and Land Elevation Satellite-2)激光卫星数据和光学遥感影像开展主被动融合水深测量的方法。首先通过信号点提取、水面/水底识别、水下点折射改正等步骤处理ICESat-2数据,获得水深值,随后以激光点作为控制,计算光学水深反演模型参数,最后由点及面地获取大范围高精度水深。实验表明,甘泉岛区域主被动融合测深中误差优于1.30m,基于激光卫星数据的主被动融合测深方法能够为浅水水深测量提供新手段。  相似文献   

海洋调查测量信息系统(一):硬件部分          下载免费PDF全文

范龙  王川  邓玉芬  张博  孙磊  刘传勇  高飞 《海洋测绘》2020,40(3):73-77

在调查测量船的设计论证过程中,针对调查测量设备信息综合处理和任务指挥控制的需求,基于对调查测量船典型装备配置及能力的分析,提出了由软硬件两部分组成的调查测量信息系统,设计了由数据采集分发平台、声学同步控制模块和数据远程通信模块组成的系统硬件部分,实现了调查测量信息的集中采集、实时分发、远程传输,以及调查测量作业的同步控制,有效保证了调查测量船装备布局的统一性和科学性,为海上同步高效作业能力的生成提供了硬件保障。  相似文献   

Cu2+对序批式反应器中活性污泥胞外聚合物产量及其组分的影响     

李姗姗  朱四富  马丙瑞  于娜玲  赵长坤  信帅帅  潘云浩  吴淑妍  武原原  高孟春 《中国海洋大学学报(自然科学版)》2020,(2):107-115

研究了长期暴露条件下Cu2+对序批式反应器(SBR)性能及其活性污泥胞外聚合物(EPS)特性的影响。结果表明,进水中加入10 mg·L-1的Cu2+后,在SBR运行的第16~55天,COD和NH+4-N的去除率保持稳定;在第56~75天,COD和NH+4-N的平均去除率与进水Cu2+浓度为0 mg·L-1时相比分别下降了3.88%和6.41%。浓度为10 mg·L-1的Cu2+长期作用下,活性污泥中EPS、松散附着EPS(LB-EPS)和紧密附着EPS(TB-EPS)产量及LB-EPS和TB-EPS中蛋白质(PN)含量增加。傅里叶变换红外光谱分析表明10 mg·L-1 Cu2+的长期暴露导致TB-EPS中PN的C=O键、N-H键和C-O键相对含量降低。X射线光电子能谱(XPS)测试结果显示在10 mg·L-1 Cu2+长期暴露条件下,LB-EPS和TB-EPS中元素Cu和O百分含量增加。  相似文献   

Space Changes in the Rural Tourism Area of Mufu Town,Hubei Province,China     

TAO Hui  GAO Jing  CHEN Kaiqiang 《资源与生态学报(英文版)》2020,11(6):633-644

In a society dominated by tourism consumption, space changes occurring in rural areas can generally reflect their social changes. On the theoretical basis of flow, regeneration and adaptation of rural tourism space, this paper originally and creatively proposes that the spatial elements in a rural tourist area can be classified into three categories: Attractions (A), Towns (T) and Villages (V). By analyzing the spatial transformation characteristics of A, T and V, five types of rural spatial transition modes are found, the types of heritage, theme park, those serving as scenic spots, leisure industrial clusters and ecotourism areas. These different classes emerge due to their geographical differentiation. They show the same spatial evolution trend: The Attractions are distributed throughout the whole area and characterized by diversification; supporting services facilities gather in the Towns; and the Villages are landscape images. In this area the traditional rural benefit trends toward that of compound development. Mufu Town, Hubei province, is taken as a study case, and the changing characteristics of A, T and V from 2006 to 2016 are described. Problems in the process of establishing the new spatial order are considered. In order to realize the synergy between production space, living space and ecological space, the interactive development between Attractions, Towns and Villages is recommended. The perspective of Attraction-Town-Village (ATV) can lead to a better understanding of the situation of tourism space in rural areas and provide directions for thinking about the reconstruction path for the modernization of traditional societies.  相似文献   

RELOCATION OF THE 23 NOVEMBER 2017 WULONG M_S5.0 EARTHQUAKE SEQUENCE AND ANALYSIS OF ITS SEISMOGENIC FAULT          下载免费PDF全文

LI Cui-ping  TANG Mao-yun  GUO Wei-ying  HUANG Shi-yuan  WANG Xiao-long  GAO Jian 《地震地质》2019,41(3):603-618

The Wulong M_S5.0 earthquake on 23 November 2017, located in the Wolong sap between Wenfu, Furong and Mawu faults, is the biggest instrumentally recorded earthquake in the southeastern Chongqing. It occurred unexpectedly in a weak earthquake background with no knowledge of dramatically active faults. The complete earthquake sequences offered a significant source information example for focal mechanism solution, seismotectonics and seismogenic mechanism, which is helpful for the estimation of potential seismic sources and level of the future seismic risk in the region. In this study, we firstly calculated the focal mechanism solutions of the main shock using CAP waveform inversion method and then relocated the main shock and aftershocks by the method of double-difference algorithm. Secondly, we determined the seismogenic fault responsible for the M_S5.0 Wulong earthquake based on these calculated results. Finally, we explored the seismogenic mechanism of the Wulong earthquake and future potential seismic risk level of the region. The results show the parameters of the focal mechanism solution, which are:strike24°, dip 16°, and rake -108° for the nodal plane Ⅰ, and strike223°, dip 75°, and rake -85° for the nodal plane Ⅱ. The calculations are supported by the results of different agencies and other methods. Additionally, the relocated results show that the Wulong M_S5.0 earthquake sequence is within a rectangular strip with 4.7km in length and 2.4km in width, which is approximately consistent with the scales by empirical relationship of Wells and Coppersmith(1994). Most of the relocated aftershocks are distributed in the southwest of the mainshock. The NW-SE cross sections show that the predominant focal depth is 5~8km. The earthquake sequences suggest the occurrence features of the fault that dips northwest with dip angle of 63° by the least square method, which is largely consistent with nodal planeⅡof the focal mechanism solution. Coincidentally, the field outcrop survey results show that the Wenfu Fault is a normal fault striking southwest and dipping 60°~73° by previous studies. According to the above data, we infer that the Wenfu Fault is the seismogenic structure responsible for Wulong M_S5.0 earthquake. We also propose two preliminary genetic mechanisms of "local stress adjustment" and "fluid activation effect". The "local stress adjustment" model is that several strong earthquakes in Sichuan, such as M8.0 Wenchuan earthquake, M7.0 Luzhou earthquake and M7.0 Jiuzhaigou earthquake, have changed the stress regime of the eastern margin of the Sichuan Basin by stress transference. Within the changed stress regime, a minor local stress adjustment has the possibility of making a notable earthquake event. In contract, the "fluid activation effect" model is mainly supported by the three evidences as follows:1)the maximum principle stress axial azimuth is against the regional stress field, which reflects NWW-SEE direction thrusting type; 2)the Wujiang River crosscuts the pre-existing Wenfu normal fault and offers the fluid source; and 3)fractures along the Wenfu Fault formed by karst dissolution offer the important fluid flow channels.  相似文献   

2013年岷县—漳县6.6级地震地磁垂直分量日变化低点时间空间分布特征     

戴勇  高立新  姚丽  朱培育  格根  王磊 《地震》2019,39(3):106-114

2013年6月16日, 中国大陆西部出现地磁低点位移。 异常出现后一个月内, 位于低点位移分界线附近发生7月22日岷县、 漳县交界6.6级地震。 本文通过采用实测低点时间减去理论低点时间的方法剔除低点时间经度效应, 并以剔除经度效应后低点时间为0 h的等值线作为低点位移分界线, 2013年岷县—漳县6.6级地震震中处于6月16日地磁低点位移分界线上。 对异常期间的中国大陆地区地磁垂直分量日变形态进行统计, 发现其存在显著的分区特征, 低点时间为正的区域内日变化形态基本呈现W型, 低点时间为负的区域内日变化形态主要呈现V字型特征。 低点位移异常日期间, 中国大陆存在显著的高梯度带, 本文采用梯度值定量描述低点时间空间变化程度。 在6月13日正常日期间, 中国大陆地区未出现梯度值大于1.5 h/(°)的区域, 在6月16日异常日期间, 出现梯度值大于1.5 h/(°)的区域, 2013年岷县—漳县6.6级地震位于高梯度区边缘。  相似文献   

郯庐断裂带新沂—泗洪段土壤气Rn体积活度和CO2浓度特征研究     

缪阿丽  张扬  方震  李锋  王维  高力 《地震》2019,39(1):48-57

郯庐断裂带江苏段地区4个剖面进行了土壤气Rn体积活度和CO₂浓度测量结果显示, 自北向南土壤气Rn体积活度均值分别为22.9 kBq/m³、 35.5 kBq/m³、 40.2 kBq/m³、 26.6 kBq/m³; 自北向南土壤气CO₂浓度均值分别为0.669%、 0.400%、 0.503%、 1.109%。 土壤气Rn体积活度和CO₂的浓度在空间分布上具有较好的一致性, 这可能与CO₂是Rn的载气有关。 综合分析土壤气Rn和CO₂测量结果以及水准资料可得, 2017年土壤气Rn高值出现在晓店段可能与区域应力应变调整有关。 本研究不仅为研究区以后的土壤气研究提供了参考, 同时也可为研究区的构造活动研究提供地球化学资料参考。  相似文献   

利用接收函数研究程海断裂带莫霍面深度和地壳内S波速度结构特征     

陈佳  高琼  王军  邓嘉美 《地震》2019,39(1):72-80

利用程海断裂带附近27个数字地震台站远震波形资料, 提取每一个台站的接收函数, 计算出各台站莫霍面深度同时利用时间域线性反演方法, 获得了各个台站下方的横波速度。 结果显示: 程海断裂带莫霍面深度从南部42 km增至北部的54 km, 南部和北部莫霍面深度有明显的不同。 从程海断裂带下方不同深度S波速度剖面可以看出, 宾川及其北东部地区中下地壳存在明显的低速层, 此低速层可能与还没有固结的热物质有关。 而永胜南部地区, 地壳中S波速度垂直变化剧烈, 低速异常高速异常交替丛生, 这可能是此区地震频发的主要原因。 同时, 本文对宽频带地震仪和短周期地震仪得到的接收函数进行了初步的对比分析。  相似文献   

帕隆藏布流域冰湖变化及危险性评估     

刘娟  姚晓军  高永鹏  祁苗苗  段红玉  张大弘 《湖泊科学》2019,31(4):1132-1143

冰湖作为区域气候变化的灵敏指示器和主要冰川灾害的启动器，认识其空间分布及变化特征对探讨冰湖对气候变化的响应规律及冰湖溃决危险性评估具有重要意义.基于1968-1980年地形图数据和1994-2016年Landsat TM/OLI遥感影像资料，综合利用RS、GIS技术和数理统计方法分析帕隆藏布流域面积≥ 0.01 km²冰湖时空分布及其动态变化，并对潜在危险性冰湖进行判别和评估.结果表明：2016年帕隆藏布流域共有冰湖351个，面积50.48 km²，且面积和数量分别以面积>1 km²和面积<0.1 km²的冰湖为主，这些冰湖主要分布于海拔2800~5400 m之间.近50年来帕隆藏布流域冰湖总体呈数量增多、面积增加态势；海拔<3000 m的冰湖相对稳定，而海拔>4500 m的冰湖数量和面积增加则相对迅速.近50年间帕隆藏布流域冰川面积减少591.34 km²，气候变暖导致的冰川末端退缩和冰川融水增加为冰湖形成和扩张提供了发育空间和物质来源.切毛措、光谢错等9个冰湖为潜在危险性冰湖，预计未来一段时间内帕隆藏布流域冰湖溃决可能处于活跃阶段，其形成和暴发也将更加频繁.  相似文献   

鲁西大汶口地区全新世临沂组沉积物粒度分布特征及地质意义          下载免费PDF全文

高明波 《山东国土资源》2018,34(7)

出露于大汶口盆地的临沂组为一套第四系松散堆积物,上部以土黄色、灰黄色含砂质粉砂、粉砂质粘土为主,下部为砂砾石层,是大汶口盆地内河流演化过程中的沉积响应和物质记录。通过对临沂组进行研究,可以反演大汶口盆地第四纪以来的沉积区水动力环境、物质运移方式和沉积环境。该文在区域地质调查工作的基础上,结合粒度分析频率曲线、概率累积曲线、粒度参数和沉积物宏观特征,对临沂组的沉积相、沉积环境和沉积韵律进行了研究。研究表明,大汶口地区临沂组下部为河床亚相边滩沉积微相,上部为河漫亚相河漫滩沉积微相,经历了由简单高能→复杂中能-中低能→简单中低能→复杂中低能的水动力沉积环境变化。另外依据岩石组合特征,将其划分为4个明显的沉积韵律和1个不明显的沉积韵律组。  相似文献