双层交叉口桥梁结构设计

未来城市正朝着立体空间方向发展,立体交通将随处可见双层交叉口,而交叉口处桥面往往受到地面道路净高、桥墩等诸多因素的影响,因此,双层交叉口的结构设计显得尤为重要。以简州新城立体交通中双层交叉口为例,提出了三种不同的结构设计做法,并通过有限元模型进行分析和对比,得出一些定性和定量的工程结论,为类似工程提供借鉴。     

大城市快速路网布局方法研究

针对我国大城市干道网布局主要以环放射式为主的现状,从计算数学的角度出发,提出了主要面向环放射式路网结构的基于交通单元划分的大城市快速路布局规划方法,并给出了快速内环半径计算和交通单元规模确定的方法。     

均衡隧道各级围岩施工产值利润率的探讨

通过对隧道工程不同围岩条件下施工产值利润率差异较大的原因分析，指出围岩级别不同的隧道施工产值利润率不均易引发施工安全和工程质量问题。此文提出，消除这种现象的根本对策是完善和改进隧道工程工程量清单计量规则。     

Variability of river plumes off Northwest Iberia in response to wind events

The Western Iberian Buoyant Plume (WIBP) is a low-salinity lens formed by river discharge and continental run-off extending along the shelf off Northwest Iberia. The variability of this structure is evaluated with a numerical model forced by real meteorological data and climatologic river discharge during late 2002, when conditions were those of a typical autumn. The direction and intensity of the wind-induced Ekman transport, but also the previous conditions and the duration of the event are found to determine plume behavior. We have identified three characteristic situations: a) confinement of the plume to the coast during downwelling — southerly-winds, b) expansion of the plume during the declining phase of the downwelling event by relaxation of the wind, and c) expansion of the plume by upwelling — northerly-winds. The short time scale of the response of the plume (1–3 h) adds timing between wind events and the phase of the tide as an additional source of variability. In all cases the Iberian Poleward Current (IPC), a saltier and warmer poleward current flowing over the slope, responds as well to wind changes. Furthermore, our simulations illustrate how topography and differences in the river discharge induce local differences in dynamics. Comparisons to available observations show a reasonable model skill. Differences between wind measurements and wind forcing applied to the model appear to be a major source of uncertainty in model results.     

海绵城市径流控制模型研究

通过模型可以精细化地计算海绵城市的核心指标——年径流总量控制率，但建立模型时需要关注其参数、边界，并对概化以及率定进行相应的规范化。为此，在建模过程中，对降雨序列长短、步长影响以及模型概化过程中的管网考虑进行了分析，同时比较了渗透速度、不透水率、硬化面积收集率、蒸发量的不同设置方式等建模敏感参数，并对率定方式进行了初步探索。所归纳出的结论可为其他海绵城市径流模型搭建提供借鉴。     

Effect of wave boundary layer on sea-to-air dimethylsulfide transfer velocity during typhoon passage

A full-spectral third-generation ocean wind–wave model (Wavewatch-III) implemented in the South China Sea is used to investigate the effects of the wave boundary layer on the drag coefficient and the sea-to-air transfer velocity of dimethylsulfide (DMS) during passage of Typhoon Wukong (September 5–11, 2000) with a maximum sustained wind speed of 38 m s^− 1. The model is driven by the reanalyzed surface winds (1° × 1°, four times daily) from the National Centers for Environmental Prediction. It is found that the wave boundary layer evidently enhances (16.5%) the drag coefficient (in turn increases the momentum flux across the air–sea interface), and reduces (13.1%) the sea-to-air DMS transfer velocity (in turn decreases the sea-to-air DMS flux). This indicates the possibility of important roles of wave boundary layer in atmospheric DMS contents and global climate system.     

编尾场平面溜放作业的调速方法

针对编组站尾部平面溜放速度控制普遍处于人工状态的现状,提出一种调速控制方法。     

综合管沟的设计探讨

结合工程实际,对城市道路下综合管沟设计的前期条件、程序、各种管线的特点和排布原则等设计构思进行了概括性的介绍,并提出综合管沟设计要点,与广大同仁交流设计经验,共同提高设计水平。     

最低价中标在公路工程招投标中存在的问题及对策

针对现阶段招标工作中最低价中标所存在的问题,进行了一定的分析,并提出了相应的防治对策。     

智慧城市雨水排水工程建设问题分析

随着社会的不断发展与进步，越来越多的城市形成了新一代的信息技术，充分应用于城市的各行各业，达到了智慧城市。但随着智慧城市的进程不断加快，城市雨水的排水工程的要求也不断地提高。现通过对国内外排水系统的发展现状，以及关键问题和排水技术进行研究分析，建议对城市雨水排水点加强勘探，从主干网开始逐步实现城市的自流排水，解决社区排水管网的截面占用问题；布局街道容水层进行雨水排水缓冲，通过购买公共服务模式实现排水的商业化。从而进一步形成智慧化城市雨水排水工程的建设。