饱和可液化土中地下结构在震后固结中的响应

饱和可液化土中地下结构在强震作用下会由于土层液化而上浮,从而对地下结构造成破坏。可液化土在地震结束之后,将由于超静孔隙水压力的消散而产生固结变形,而地下结构在土层震后固结过程中的响应是一个值得研究的问题。以地下结构在土层震后固结过程中的垂直位移为重点,应用非线性动力两相体有限元方法研究饱和可液化土和地下结构相互作用体系在地震后土层固结过程中的响应。研究结果表明,地下结构的上浮趋势不会在地震结束时立即结束,而是在土层超静孔隙水压力经过一段时间的重分布及消散以后停止,之后地下结构有一定的沉降位移,但沉降位移远小于上浮位移,因此地下结构在震后会残留向上的垂直位移。文中还讨论了土层的应力路径响应、水压消散过程及截断墙与土层渗透系数对地下结构在震后固结过程中响应的影响,试图讨论饱和可液化土中地下结构在震后固结中响应的机理。     

Evidence of stream response to Holocene climatic change in a small Wisconsin watershed

During the Holocene, moderate climatic and vegetational changes triggered several episodes of adjustment in the Brush Creek fluvial system. The alluvial chronology includes an episode of erosion at 7800 – 5700 yr B.P. corresponding to the mid-Holocene precipitation minimum and an episode of floodplain construction at 5700 – 5000 yr B.P. corresponding to a rapid increase in precipitation. Holocene climatic changes have influenced the sedimentology of the alluvial deposits and soil development on them. Fluvial adjustment is caused primarily by hydrologic and hydraulic changes related to climatic change, but there is no simple model for fluvial response to climatic change. The relationship between the direction of climatic change and the type of fluvial response is complex.     

Correction to: Mapping method of rainfall-induced landslide hazards by infiltration and slope stability analysis

Landslides - A Correction to this paper has been published: https://doi.org/10.1007/s10346-021-01642-4     

Correction to: Extreme waves induced by cyclone Nargis at Myanmar coast: numerical modeling versus satellite observations

Natural Hazards - A correction to this paper has been published: https://doi.org/10.1007/s11069-021-04687-9     

Tricyclic terpane maturity parameters: response to heating by an igneous intrusion

The effects of thermal maturation upon the abundance and composition of the tricyclic terpanes have been investigated within a single sedimentary horizon within the Dun Caan Shale Member (Isle of Skye, Scotland) intruded by a 0.9 m thick Tertiary dolerite dyke. Heating by the igneous body caused the concentrations of all 13β(H),14α(H) and 13α(H),14α(H) tricyclic terpanes to increase towards or within the effective ‘oil window’, recording generation from abundant non-hydrocarbon precursors, such as kerogen- and asphaltene-bound components. Progressive changes in tricyclic terpane composition accompany these concentration changes. An increase in the C₂₃ βα/αα maturity parameter towards the dyke resulted from the relatively greater rate of generation of the βα isomer, combined with the earlier decline in concentration (by degradation or isomerisation) of the αα component. The tricyclics/(tricyclics+hopanes) parameter shows a dramatic increase within the latter part of the oil window, due to the greater relative thermal stability of the tricyclic terpanes. The quantitative data demonstrate the importance of the processes of generation (from non-hydrocarbon fractions of the sedimentary organic matter) and thermal degradation in the operation of tricyclic terpane maturity parameters.     

Correction to: Using Causal Inference in Field Development Optimization: Application to Unconventional Plays

Mathematical Geosciences - Unfortunately, in the original version of the article the first and second name of the fourth author were wrong.     

Correction to: Social determinants in choice of shelter: an evidence-based analysis

Natural Hazards - The article was published with categories “80,000–10,999” and “≥?11,000” of the variable Family monthly income in Table 2 and...     

Correction to: Tropical cyclone: expressions for velocity components and stability parameter

Historically, Leyte Gulf in central eastern Philippines has received catastrophic damage due to storm surges, the most recent of which was during Typhoon Haiyan in 2013. A city-level risk assessment was performed on Leyte Gulf through synthetic storm generation, high-resolution ocean modeling, and decision tree analyses. Cyclones were generated through a combination of a Poisson point process and Monte Carlo simulations. Wind and pressure fields generated from the cyclones were used in a storm surge model of Leyte Gulf developed on Delft3D. The output of these simulations was a synthetic record of extreme sea level events, which were used to estimate maximum surge heights for different return periods and to characterize surge-producing storm characteristics using decision tree analyses. The results showed that the area most prone to surges is the Tacloban–Basey area with a 2.8?±?0.3 m surge occurring at a frequency of every 50 years. Nearby Palo area will likely receive a surge of 1.9?±?0.4 m every 50 years while Giporlos–Salcedo area a surge of 1.0?±?0.1 m. The decision tree analysis performed for each of these areas showed that for surges of 3–4 m, high-velocity winds (>?30 m/s) are consistently the main determining factor. For the areas, Tacloban, Basey, and Giporlos–Salcedo, wind speed was also the main determining factor for surge?>?4 m.     

ZK1502 孔 纠 斜 技 术

介绍了山东某矿区ZKl502孔透孔跑偏的过程及纠斜措施，分析了跑斜原因，提出了注意事项。     

Regularities in the response of spectral lines to small perturbations in physical quantities in the photosphere

Numerical simulations are used to establish a number of dependencies between small perturbations in physical quantities in the photosphere and small variations in the Stokes profiles of spectral lines. A perturbation of any physical quantity in the model photosphere shifts every point in a line profile in the direction perpendicular to the tangent to the profile at that point. The actions on the wing of a spectral line of perturbations in the magnetic field and radial velocity are equivalent for a particular ratio of these perturbations (if the line is fully split in the magnetic field). If the response of part of a line wing is considered as a shift in wavelength, the area under the curve representing the response to perturbations in the magnetic field and radial velocity has a simple physical meaning.     

Correction to: Numerical investigation of small- and medium-diameter drain wells to stabilise deep landslides

Acta Geotechnica - In the original publication, the first name of the authors was exchanged with the last name inadvertently. The name of the authors should be as below.