不动产登记数据的建筑分层分户三维建模关键技术     

熊成利  龚旭峥  沈正中  龙容  王硕 《测绘通报》2022,(4):149-153

随着实景三维建设的不断推进,城市管理向立体化、精细化和数字化发展,建筑分层分户三维模型能够承载更详细精准的属性信息,并能叠加倾斜三维模型进行场景渲染,可以更好地服务于城市不动产三维管理、数字赋能社会治理等工作。本文以“萧山区数字赋能社会治理”项目建设为背景,探索和实现了基于不动产登记数据的建筑分层分户三维建模关键技术,形成了从全空间多源异构数据归集至城市全域建筑分层分户三维模型建设的一整套生产技术流程,为城市不动产三维管理、数字赋能社会治理等提供了有效的技术支撑和数据基础。  相似文献   

Co- and post-seismic surface deformation and gravity changes of Ms7.0 Lushan,earthquake     

Kai Wang  Chengli Liu  Xiong Xiong  Yong Zheng 《地震学报(英文版)》2013,(3):207-212

On April 20, 2013, an earthquake with mag- nitude 7.0 occurred in the southwest of the Longmenshan fault system in and around Lushan County, Sichuan Province, China. This devastating earthquake killed hun- dreds of people, injured 10 thousand others, and collapsed countless buildings. In order to analyze the potential risk of this big earthquake, we calculate the co- and post-seismic surface deformation and gravity changes of this event. In this work, a multilayered crustal model is designed, and the elastic dislocation theory is utilized to calculate the co- and post-seismic deformations and gravity changes. During the process, a rupture model obtained by seismic waveform inversion （Liu et al. Sci China Earth Sci 56（7）： 1187-1192, 2013） is applied. The time-dependent relaxation results show that the influences on Lushan and its surrounding areas caused by the Ms7.0 Lushan earthquake will last as long as 10 years. The maximum horizontal displacement, vertical uplift, and settlement are about 5 cm, 21.24 cm, and 0.16 m, respectively; the maximal positive and nega- tive values of gravity changes are 45 and -0.47 μGal, respectively. These results may be applied to evaluate the long-term potential risk caused by this earthquake and to provide necessary information for post-earthquake reconstruction.  相似文献   

Evolution of an anticyclonic eddy southwest of Taiwan   总被引：8，自引：1，他引：7  

Tingting Zu  Dongxiao Wang  Changxiang Yan  Igor Belkin  Wei Zhuang  Ju Chen 《Ocean Dynamics》2013,63(5):519-531

Satellite images of sea-surface temperature, surface chlorophyll a concentration, and sea-level anomaly, together with ocean reanalysis data of Asia and Indian–Pacific Ocean (AIPOcean1.0), are utilized to study the three-dimensional characteristics and evolution of an anticyclonic warm eddy adjacent to the southwest coast of Taiwan during October and November 2006. Originated from the Kuroshio intrusion in the Luzon Strait, but unlike previously found westward moving anticyclonic eddies (AE) in the northeastern South China Sea, this AE was so close to the Taiwan coast and stayed where it was formed for over 1 month until it dissipated. Energy analysis is utilized to study the evolution process of the AE, and it shows that the barotropic instability (BTI) and baroclinic instability introduced by the Kuroshio intrusion flow appear to be the main energy sources for the AE. Periodical enhancement/relaxation of local northeasterly monsoon and its associated negative wind stress curl modify the current patterns in this region, reinforce the intraseasonal variability of the Kuroshio intrusion flow, and act together with Kuroshio to form the AE. Eddies detected from AIPOcean1.0 data also show that AEs are most likely to be generated southwest of Taiwan during the transition period of summer monsoon to winter monsoon, and generally, the BTI of Kuroshio intrusion contributes more than the direct wind stress work to the increase of the eddy kinetic energy for the generation and growth of the AEs.  相似文献   

Co- and post-seismic surface deformation and gravity changes of M S7.0 Lushan,earthquake     

Kai Wang  Chengli Liu  Xiong Xiong  Yong Zheng 《地震科学（英文版）》2013,26(3-4):207-212

On April 20, 2013, an earthquake with magnitude 7.0 occurred in the southwest of the Longmenshan fault system in and around Lushan County, Sichuan Province, China. This devastating earthquake killed hundreds of people, injured 10 thousand others, and collapsed countless buildings. In order to analyze the potential risk of this big earthquake, we calculate the co- and post-seismic surface deformation and gravity changes of this event. In this work, a multilayered crustal model is designed, and the elastic dislocation theory is utilized to calculate the co- and post-seismic deformations and gravity changes. During the process, a rupture model obtained by seismic waveform inversion (Liu et al. Sci China Earth Sci 56(7):1187–1192, 2013) is applied. The time-dependent relaxation results show that the influences on Lushan and its surrounding areas caused by the M _S7.0 Lushan earthquake will last as long as 10 years. The maximum horizontal displacement, vertical uplift, and settlement are about 5 cm, 21.24 cm, and 0.16 m, respectively; the maximal positive and negative values of gravity changes are 45 and ?0.47 μGal, respectively. These results may be applied to evaluate the long-term potential risk caused by this earthquake and to provide necessary information for post-earthquake reconstruction.  相似文献   

江西星子县东牯岭花岗石矿山环境地质问题及对策     

冯绍辉  尹祝  卢宝荣  谢振东 《地质灾害与环境保护》2012,23(2):40-43

长期的露天开采严重破坏了矿山地理地质环境,产生了地质灾害隐患。在介绍矿区地理地质背景的基础上,系统地描述该矿区土地、植被、地形和地貌被破坏的情况,分析崩塌、滑坡和泥石流地质灾害隐患。为改善生态环境,打造全国知名旅游景区,提出全面停止矿山开采,并进行分期治理。先期重点清除存在隐患的废石堆,然后清除边坡破碎危岩体,并辅以绿化措施。  相似文献   

新密煤田翟沟井田山西组煤层特征及聚煤环境分析     

崔金池  俎新许  张坤 《中国煤炭地质》2012,(7):15-17,28

以新密煤田翟沟井田勘探资料为基础,对井田区域特征、山西组煤层特征和沉积环境进行分析。研究表明：山西组下段为以泥坪＋泥炭沼泽＋泥坪沉积序列为主的潮坪沉积,山西组上段为以弱还原环境河流作用为主的三角洲沉积体系,山西组聚煤环境为滨岸潮坪环境;山西组二。煤层层位稳定,煤层结构简单,煤层厚度为0．82-12．20m,一般3—5m,平均厚度3．84m,煤层厚度的变化是受沉积环境、后期冲刷作用及构造作用综合作用的结果。  相似文献   

Decadal variation of thermocline-sea surface temperature feedback in the tropical Indian Ocean and the underlying mechanisms     

Meiqi Zhang  Shuangwen Sun  Lin Liu  Yongcan Zu  Lin Feng 《海洋学报(英文版)》2021,40(11):31-38

The thermocline-sea surface temperature (SST) feedback is the most important component of the Bjerknes feedback, which plays an important role in the development of the air-sea coupling modes of the Indian Ocean. The thermocline-SST feedback in the Indian Ocean has experienced significant decadal variations over the last 40 a. The feedback intensified in the late twentieth century and then weakened during the hiatus in global warming at the early twenty-first century. The thermocline-SST feedback is most prominent in the southeastern and southwestern Indian Ocean. Although the decadal variations of feedback are similar in these two regions, there are still differences in the underlying mechanisms. The decadal variations of feedback in the southeastern Indian Ocean are dominated by variations in the depth of the thermocline, which are modulated by equatorial zonal wind anomalies. Whereas the decadal variation of feedback in the southwestern Indian Ocean is mainly controlled by the intensity of upwelling and thermocline depth in winter and spring, respectively. The upwelling and thermocline depth are both affected by wind stress curl anomalies over the southeastern Indian Ocean, which excite anomalous Ekman pumping and influence the southwestern Indian Ocean through westward propagating Rossby waves.  相似文献   

Recent improvements to the physical model of the Bohai Sea,the Yellow Sea and the East China Sea Operational Oceano-graphy Forecasting System     

Ang Li  Xueming Zhu  Yunfei Zhang  Shihe Ren  Miaoyin Zhang  Ziqing Zu  Hui Wang 《海洋学报(英文版)》2021,40(11):87-103

In order to satisfy the increasing demand for the marine forecasting capacity, the Bohai Sea, the Yellow Sea and the East China Sea Operational Oceanography Forecasting System (BYEOFS) has been upgraded and improved to Version 2.0. Based on the Regional Ocean Modeling System (ROMS), a series of comparative experiments were conducted during the improvement process, including correcting topography, changing sea surface atmospheric forcing mode, adjusting open boundary conditions, and considering atmospheric pressure correction. (1) After the topography correction, the volume transport and meridional velocity maximum of Yellow Sea Warm Current increase obviously and the unreasonable bending of its axis around 36.1°N, 123.5°E disappears. (2) After the change of sea surface forcing mode, an effective negative feedback mechanism is formed between predicted sea surface temperature (SST) by the ocean model and sea surface radiation fluxes fields. The simulation errors of SST decreased significantly, and the annual average of root-mean-square error (RMSE) decreased by about 18％. (3) The change of the eastern lateral boundary condition of baroclinic velocity from mixed Radiation-Nudging to Clamped makes the unreasonable westward current in Tsushima Strait disappear. (4) The adding of mean sea level pressure correction option which forms the mean sea level gradient from the Bohai Sea and the Yellow Sea to the western Pacific in winter and autumn is helpful to increasing the fluctuation of SLA and outflow of the Yellow Sea when the cold high air pressure system controls the Yellow Sea area.  相似文献   

秦岭早中生代壳幔岩浆混合作用——来自东江口花岗岩体闪长质包体的地球化学证据   总被引：3，自引：0，他引：3  

李雷  张成立  周莹  田会全  李小菲 《高校地质学报》2012,18(2):291-306

      东江口花岗岩及闪长质包体分别获得了218 Ma 和224 Ma 的形成年龄,闪长质包体中存在岩浆不平衡结构并发育与寄 主花岗岩相同的钾长石斑晶及淬冷形成的针状磷灰石,揭示了花岗岩形成过程中曾发生二元岩浆混合作用。这种混合作用 已造成寄主花岗岩和闪长质包体化学组成的趋同,同时使得它们的Sr-Nd-Pb 同位素组成发生强烈均一化。但暗色闪长质包 体锆石具有较宽的εHf（t ）值（-4.58~3.31）,保留了二端元岩浆源区的特征。秦岭早中生代同期闪长质包体锆石εHf（t ）＞ 10 及寄主花岗岩锆石εHf（t ）＜ -10 的差异表明,它们分别来自相对亏损地幔源区和中元古代滞留于地壳的幔源基性物质, 而两个源区的岩浆,自224 Ma 以来发生强烈混合作用,形成大规模的壳幔混合花岗岩体。  相似文献   

风云三号气象卫星红外分光计探测大气CO2浓度的通道敏感性分析     

戴铁  石广玉  漆成莉  徐娜  张兴赢  杨溯 《气候与环境研究》2011,16(5):577-585

依据红外分光计（InfraRed Atmospheric Sounder,IRAS）光谱通道特征,发展了基于IRAS的大气辐射传输计算模式。以大气分子吸收光谱数据集（HIgh resolution TRANsmission,HITRAN） 2004为初始谱线输入资料,利用该模式模拟计算IRAS在CO2 吸收带的10个通道辐射率测值对CO2浓度变化的响应,并对比了其与大气温度和水汽、O3等气体浓度误差对辐射率测值的影响,探讨了利用风云三号气象卫星探测大气CO2浓度的可行性。结果表明,IRAS的通道4最适于用来监测大气CO2浓度的变化,当CO2体积混合比浓度变化在10×10-6时,对应的辐射率变化同仪器等效噪声辐射率相当,所以IRAS在理想状态下,最高可分辨的大气CO2浓度变化约为10×10-6。  相似文献