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261.
长江三角洲地区是寻找长江历史演化信息的关键地区之一。本文通过DY03孔长时间序列元素地球化学的研究,利用元素地球化学特征示踪物源变化,初步揭示长江三角洲地区物源变化的总体情况,分析讨论长江三角洲地区沉积记录对长江贯通的指示意义。研究发现,在晚上新世31Ma左右时期,钻孔中指示物源变化的 K2O/Al2O3, SiO2/Al2O3, Zr/Ti,Th/Sc,Th/Co,Th/Cr,Nb/Co等元素比值都发生由高到低的显著变化,而3.1Ma之后元素比值变化不大。化学风化A-CN-K图解也进一步说明在3.1Ma前后,沉积物具有不同的化学风化趋势。以上特征说明,在晚上新世时期本区物源曾发生重大变化,表现为沉积物来源由近源转变为远源,源岩由酸性长英质矿物为主转变为基性矿物为主。这次物源变化很可能说明最早在晚上新世长江上游物质已经通过长江三峡输送到现代长江三角洲地区。 相似文献
262.
地表变形、活动断裂和地球物理的综合分析表明,菲律宾洋壳向欧亚大陆的俯冲导致的地幔对流是控制中国东部沿海地区晚新生代以来构造作用的主导因素,是长江口地区地面沉降的主要深部动力学机制。由于地幔对流和青藏高原挤压共同作用导致的地壳热流值的差异则是长江口地区西部隆升、东部沉降且向东沉降速率增大的直接驱动力。预测未来长江口地区的基岩沉降范围将以>10cm/a的速率向西扩大,沉降速率将呈明显加速趋势,40000a之内上海市可能被海水淹没,但板块构造演化的“渐变”特征决定其对当地未来的人类活动不会造成显著影响。根据“地壳均衡理论”,建议在长江口南西部(浙江省北东部)的丘陵山区加大重力载荷如加快城市化进程或人工造山以减小和控制上海地区的沉降。 相似文献
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265.
Zhou W. D. Xie S. Y. Bao Z. Y. Carranza E. J. M. Wang Y. Tang M. L. 《Mathematical Geosciences》2022,54(1):131-150
Mathematical Geosciences - Inorganic pore structures are critical to understand the oil and gas transport and storage properties of unconventional reservoirs. However, it can be difficult to... 相似文献
266.
Heping Xie Wen Jiang Zhengmeng Hou Ying Xue Yufei Wang Tao Liu Liang Tang Dinglu Wu 《Environmental Earth Sciences》2017,76(21):732
Mineral aerosols play a significant role in gas–solid interfacial and atmospheric chemistry. Carbonation of olivine aerosol, which takes place in a multiphase reaction processes, can be an effective means to reduce the concentration of atmospheric carbon dioxide. Due to the presence of a huge reserve of silicate minerals in nature, olivine aerosol could be an ideal potential raw material for mineral carbonation for its higher reactivity with H2O and CO2. However, quantitative information about the carbonation process on the surface of natural olivine aerosol is not available. In this paper, calculations on the carbonation reaction processes with and without a H2O molecule using a periodic olivine model has been carried out via the density functional theory. The pathways and their corresponding energies and structures in the carbonation reactions have been established, and the effect of water as means to reduce the energy barriers and stabilize the carbonated structures by forming hydrogen bonds has been confirmed. 相似文献
267.
Zhengtuan Xie Guan Chen Xingmin Meng Yi Zhang Liang Qiao Long Tan 《Environmental Earth Sciences》2017,76(8):313
The determining of landslide-prone areas in mountainous terrain is essential for land planning and hazard mitigation. In this paper, a comparative study using three statistical models including weight of evidence model (WoE), logistic regression model (LR) and support vector machine method (SVM) was undertaken in the Zhouqu to Wudu segment in the Bailong River Basin, Southern Gansu, China. Six conditionally independent environmental factors, elevation, slope, aspect, distance from fault, lithology and settlement density, were selected as the explanatory variables that may contribute to landslide occurrence based on principal component analysis (PCA) and Chi-square test. The relation between landslide distributions and these variables was analyzed using the three models and the results then used to calculate the landslide susceptibility (LS). The performance of the models was then evaluated using both the highly accurate deformation signals produced by using the Small Baseline Subset Interferometric Synthetic Aperture Radar technique and Receiver Operating Characteristic (ROC) curve. Results show more deformation points in areas with high and very high LS levels, and also more stable points in areas with low and very low LS levels for the SVM model. In addition, the SVM has larger area under the ROC curve. It indicates that the SVM has better prediction accuracy and classified ability. For the interpretability, the WoE derives the class of factors that most contributed to landsliding in the study area, and the LR reveals that factors including elevation, settlement density and distance from fault played major roles in landslide occurrence and distribution, whereas the SVM cannot provide relative weights for the variables. The outperformed SVM could be employed to determine potential landslide zones in the study area. Outcome of this research would provide preliminary basis for general land planning such as choosing new urban areas and infrastructure construction in the future, as well as for landslide hazard mitigation in Bailong River Basin. 相似文献
268.
Spatial probabilistic modeling of slope failure using an integrated GIS Monte Carlo simulation approach 总被引:4,自引:0,他引:4
Spatial probabilistic modeling of slope failure using a combined Geographic Information System (GIS), infinite-slope stability model and Monte Carlo simulation approach is proposed and applied in the landslide-prone area of Sasebo city, southern Japan. A digital elevation model (DEM) for the study area has been created at a scale of 1/2500. Calculated results of slope angle and slope aspect derived from the DEM are discussed. Through the spatial interpolation of the identified stream network, the thickness distribution of the colluvium above Tertiary strata is determined with precision. Finally, by integrating an infinite-slope stability model and Monte Carlo simulation with GIS, and applying spatial processing, a slope failure probability distribution map is obtained for the case of both low and high water levels. 相似文献
269.
270.
An approach to studying heavy metal pollution caused by modern city development in Nanjing, China 总被引:8,自引:0,他引:8
Nanjing is currently one of the fastest developing regions in terms of construction and economy in China. Heavy metal pollution
is becoming more serious with the expansion of production and life scales. Four environmental units (highway, refinery, rubbish
dumps associated with human daily life, and shoal of the Yangtse River) were selected from the region according to the geneses
of the pollution to study and evaluate the distribution and mechanism of the contamination, the speciations of the polluting
elements, and the geneses of the pollution in the soils and sediments. The purposes of the study are to understand generally
the current situation and the cause of the pollution, and to provide a scientific basis to prevent and solve the pollution
problem. At the same time, it would be helpful to probe the effective way of studying heavy metal pollution resulting from
the development of modern cities and to accumulate data. It is indicated by the study that the heavy metals contained in the
soil of the environmental unit of the highway are Pb, Co and Cr; in the soil of the refinery Cr, V, Pb, Ni, and Co; in the
soil of the rubbish plot Co, Cu, and Sb; in the sediments of the shoal Pb, Co, Cu, and Ni. Fe-Mn oxide is given the first
place to the speciations in polluting heavy metals transmitted by air. Carbonate is more in speciations of polluting heavy
metals transmitted by water than in speciations of the metals transmitted by air. In the ten elements studied, Pb is most
directly poisonous to the plants in the region; Co and Cu are the next, and Ni is the least. Heavy metal pollution has been
occurring in the soils and sediments of the region and the situation will worsen if some effective measures are not taken.
Received: 18 October 1997 · Accepted: 3 February 1998 相似文献