城镇土地征地拆迁管理信息系统的设计研究     

郑志宏 《测绘与空间地理信息》2016,(8)

介绍了城镇土地征地拆迁管理系统的建设内容,阐述了系统建设的技术路线,描述了系统的具体设计,分析了系统的主要特点,为系统的实现提供了完整的设计方案。  相似文献   

Numerical modelling and analysis of temperature controlled density currents in Tomales Bay, California     

J.-L. Harcourt-Baldwin  G.P.J. Diedericks 《Estuarine, Coastal and Shelf Science》2006,66(3-4):417-428

The coastal region adjacent to Tomales Bay, California is dominated by wind-driven upwelling during spring and summer and the cold, upwelled water is moved towards Tomales Bay, entering the estuary with the flood tide. If the tidal excursion is ≥6 km and the cold water subducts beneath the warmer, less dense estuarine water, a temperature controlled density current may form and intrude towards the head of the estuary as a thermally stratified bottom layer. The numerical modelling was aimed at determining the capability of the Delft3D-FLOW model to reproduce the cold ocean water intrusion events, the response (development and progression) of these intrusions to differing physical scenarios and the comparative importance of the parameters to the intrusions. The numerical model successfully reproduced the density intrusions and showed that the persistence and break down of the density intrusions were affected by a number of physical parameters, to varying degrees. The sensitivity analysis showed that density intrusion formation is controlled by tidal conditions and ocean water temperature. The strength and persistence of the developed density intrusions are influenced by wind, insolation and estuary depth. Fresh water inflow at the head of the estuary had no impact on the density intrusions. Three-dimensional numerical modelling is thus a valuable tool in understanding the estuary and its functioning.  相似文献   

Evaluating fine sediment mobilization and storage in a gravel‐bed river using controlled reservoir releases     

E. L. Petticrew  A. Krein  D. E. Walling 《水文研究》2007,21(2):198-210

Two controlled flow events were generated by releasing water from a reservoir into the Olewiger Bach, located near Trier, Germany. This controlled release of near bank‐full flows allowed an investigation of the fine sediment (<63 µm) mobilized from channel storage. Both a winter (November) and a summer (June) release event were generated, each having very different antecedent flow conditions. The characteristics of the release hydrographs and the associated sediment transport indicated a reverse hysteresis with more mass, but smaller grain sizes, moving on the falling limb. Fine sediment stored to a depth of 10 cm in the gravels decreased following the release events, indicating the dynamic nature and importance of channel‐stored sediments as source materials during high flow events. Sediment traps, filled with clean natural gravel, were buried in riffles before the release of the reservoir water and the total mass of fine sediment collected by the traps was measured following the events. Twice the mass of fine sediment was retained by the gravel traps compared with the natural gravels, which may be due to their altered porosity. Although the amount of fine sediment collected by the traps was not significantly related to measures of gravel structure, it was found to be significantly correlated to measures of local flow velocity and Froude number. A portion of the traps were fitted with lids to restrict surface exchange of water and sediment. These collected the highest amounts of event‐mobilized sediments, indicating that inter‐gravel lateral flows, not just surface infiltration of sediments, are important in replenishing and redistributing the channel‐stored fines. These findings regarding the magnitude and direction of fine sediment movement in gravel beds are significant in both a geomorphic and a biological context. Copyright © 2006 John Wiley & Sons, Ltd.  相似文献   

基于倾斜摄影的三维测图技术研究     

朱轶群  吴煜心  金国建  李林琦 《测绘通报》2020,(10):48-52

近年来，随着无人机技术、机载定位技术、图像处理技术的快速发展，倾斜摄影测量技术已广泛应用于1：1000大比例尺地形图测绘中。但由于各项技术限制，普通的无人机航空摄影测量难以满足1：500大比例尺地形图测图。因此，本文以倾斜摄影测量技术为基础，从像控密度、模型分辨率、测图方式3方面展开研究，提出了一种适用于城镇1：500大比例尺地形图的倾斜测图方法。试验结果表明，文成县大比例尺地形图的成果平面精度可达0.059 m，高程精度可达0.064 m，精度情况良好，对以后采取此种方法进行测绘具有一定的借鉴作用。  相似文献   

渤海湾盆地渤中19- 6凝析气田凝析油成熟度判定及成因意义     

胡安文  于海波  王飞龙  梁舒艺  郭景震 《地质学报》2023,97(7):2354-2362

关于渤海湾盆地渤中19- 6凝析气田凝析油成熟度存在成熟与高成熟两种截然不同观点,尚未达到统一定论。本文综合利用轻烃、饱和烃和芳烃成熟度参数对凝析油成熟度进行了综合判定,并深入分析了凝析油和天然气的成因关系及凝析气藏形成机制。结果表明：异庚烷值与庚烷值、Ts/（Ts+Tm）与C29Ts/（C29Ts+C29H）、甲基单金刚烷指数与甲基双金刚烷指数、甲基菲指数、二苯并噻吩类成熟度参数和TNR2显示渤中19- 6凝析气田凝析油处于成熟阶段。结合天然气成熟度和储层流体包裹体特征,可知渤中19- 6凝析气田的原油成藏期早于天然气,随着晚期大量天然气的充注,油气会发生相控混溶作用形成含液态烃的气流体,当温度和压力达到混溶后烃类体系的露点以上,则形成凝析气藏。  相似文献   

拆迁场地建筑碎渣的处理和综合应用研究     

陈国栋  梁永辉  徐先坤 《岩土工程技术》2010,24(4):214-216,F0003

建筑碎渣作为各种建材产品废料的混合物,会给环境带来一定的危害,但也是一种再生利用率很高的资源.如果经过一定方式的处理,使其变废为宝,处理后的建筑碎渣即可成为新的建筑材料再次使用.分析了建筑碎渣所具有的物理化学特点,指出建筑碎渣存在再生利用的可行性;介绍了国内外建筑碎渣的处理现状、利用途径和发展趋势,并指出了现阶段我国对于建筑碎渣处理利用的几种主要方式和存在的问题.  相似文献   

粉煤灰扰动样现场取样问题初步探讨     

郭莹 《水文地质工程地质》2001,28(2):63-65

本文结合福州电厂粉煤灰室内试验结果分析，探讨粉煤灰扰动样现场取样及试验控制干密度的等问题，该电厂粉煤灰的沉积规律与其它电厂有所不同，灰料颗粒组细分布和距排灰口远近基本无关，取样也不能按以往经验进行。  相似文献   

单片机控制的步进电机定频脉宽调制可变细分驱动系统     

王菁蕙  梅安华 《武汉大学学报(信息科学版)》1994,(1)

本文介绍所研制的由ＭＣＳ－５１单片机控制的步进电机定频脉宽调制可变细分驱动系统。该系统采用单电压驱动。配有软件。在不改变硬件电路的前提下．通过键盘操作，可以改变细分数。系统采用数字式定频脉宽调制技术，直接对细分电流进行反馈控制。最后提出了用实验确定均匀细分电流状态字的新方法，并验证了其可行性。  相似文献   

Identification of an underfilled foreland basin system in the Upper Devonian of the Central Pyrenees: implications for the Hercynian orogeny     

Pierre?Souquet  Jean-Jacques?Delvolvé  Stéphane?BrussetEmail author 《International Journal of Earth Sciences》2003,92(3):316-337

A foreland basin succession has been identified in the Frasnian of the Central Pyrenees. This succession comprises a carbonate-dominated transgressive system which recorded the cratonward migration of the foreland basin subsidence, and siliciclastic depocenters which recorded the progression of the thrust-fold deformation. The foreland basin system has always been maintained in deep-marine environments, i.e., at an underfilled depositional state. It was associated with a thrust wedge which descended toward a deep-marine hinterland, i.e., with a type of orogenic wedge usually related to subduction zones. The Frasnian foreland basin system differs from the one known in the Carboniferous which evolved to overfilled depositional state and was associated with a thrust wedge rising toward a mountainous hinterland. Consequently, the Hercynian orogeny in the Pyrenees seems to result first, from a Frasnian thrusting controlled by a subduction zone located north of the Pyrenees, and second, from a Carboniferous thrusting controlled by the surrection of a frontal thrust belt in the Pyrenees. The association of underfilled foreland basin systems and hinterland-dipping thrust wedges, as exemplified in the Frasnian of the Pyrenees, can be interpreted as illustrative of the initial stages of thrust-wedge growth in deep-marine settings.  相似文献   

月球探测摄影测量数据处理系统方案分析     

尹明  王新义 《测绘科学与工程》2005,25(3):31-34

本文提出了月球摄影测量数据处理系统的设计原则，探讨了月球摄影测量数据处理系统的组成和研究的内容，分析了在月球探测摄影测量数据处理中，首先应该解决的关键技术问题。结论：对月球探测摄影测量数据处理系统的研究，可以保障月球探测卫星工程测绘月球表面三维影像图及地形图任务的完成，同时，也可以为后续的月球探测计划提供摄影测量的基础理论、技术、方法和实践经验。  相似文献