对宝鸡市茵香河（庙沟村-310国道桥段）防洪规划设计

通过对宝鸡市茵香河河道目前的防洪现状、存在问题及防洪规划的必要性分析,提出了防洪规划的具体设计方向,希望有关部门对其进行统一规划,以达到防洪和水土保持一体化。     

辫状河河道砂体内部构型表征方法与层次结构解析

辫状河砂体一般垂向叠置厚度大,在稀疏井网条件下,如何揭示辫状河厚层砂体空间展布规律向来是砂体建筑结构分析中的重点。本文利用岩心、测录井等资料,结合古代露头以及卫星照片现代沉积等资料建立起来的辫状河地质知识库,采用垂向分期,平面划界的方法,对小层内的厚层辫状河道砂体砂体建筑结构进行分析,其中小层内井点处的辫状河道砂体需细分至单层,并依据已有的地质知识库和地质概念模型进行井间合理插值预测,从而最终实现单期河道平面延伸轨迹的追踪和对比,然后按单期沉积发育顺序,完成复合辫状河道沉积演化过程与历史重建。该研究成果有助于指导解剖地下河流相砂体砂体层次结构及不同成因砂体叠置规律,为后期深入勘探开发及水平井部署提供理论依据。     

远距离输沙中二级加压的技术改进及应用

在黄河下游搞机淤固堤施工，由于大堤距河槽较远，需要接力泵接力传送，才能将泥浆输送到淤区。按照传统的施工方法为，接力泵出口接输沙管通往淤区。这种连接方法不需外部设备，比较简单。但有一定的弊病；在正常工作时，主泵与接力泵的油门要同步，否则，一旦接力泵油门没有提上去，从主泵输送来的泥浆到达接力泵时，会形成“水锤现象”：强大的水流冲击接力泵叶轮，使输沙管崩裂，造成事故。     

猜猜我是谁

嘿,大家好,猜猜今天我们隆重推出的这位朋友是谁?在它出场之前,让我们先听听它的自我介绍吧!不过,大家可千万不要被这位朋友的发言给迷惑了哟,要知道,最后的判断,是要由你们来做出的呢!     

Vertical distribution of sediment concentration

A simple formula is proposed to predict the vertical distribution of a suspended load concentration in a 2D steady turbulent flow. The proposed formula significantly improves the well-known Rouse formula where sediment concentration has an infinitely large value at the channel bottom and a zero value at the water surface. Based on this formula and the logarithmic velocity profile, a theoretical elementary function for the transport rate of a suspended load is developed. This equation improves the Einstein equation in which the unit-width suspended sediment discharge must be solved by numerical integration and a contradiction between the lower limit of the integral and that of velocity distribution exists.     

Modelling impact of dredging and dumping in ebb-flood channel systems

For a channel-shoal system in a funnel-shaped basin the impact of dredging and dumping is investigated using a complex process-based model. First, the residual flow and sediment transport circulations are analysed for the channel-shoal pattern, which has emerged after a long-term model simulation. Results are compared to the Western Scheldt estuary, which forms the inspiration for this study. Subsequently, different dredge and dump scenarios are modelled, according to a conceptual model, in which ebb-and flood-channels and enclosed shoals form morphodynamic units (cells) with their own sediment circulation. Model results show that dumping sediment in a channel further reduces the channel depth and induces erosion in the opposite channel, which enhances tilting of the cross-section of the cell and eventually can lead to the degeneration of a multiple channel system into a single channel. The impact of different dredging and dumping cases agrees with results from a stability analysis. This means that this type of model applied to a realistic geometry can potentially be used for better prediction of the impact of human interventions.     

2008年普通高等学校招生全国统一考试 地理单科测试试题(海南卷)

一、单选题(本题共有20小题,每小题3分,共60分)1997年12月,149个国家和地区通过了限制温室气体排放量以抑制全球变暖的《京都议定书》。《京都议定书》于2005年2月16日正式生效。完成1～2题。     

有关“地理信息技术”的知识

一、部分遥感图像的翻译标志 水体:清澈而深的水体呈蓝黑色,水浅时呈浅蓝色,含有泥沙时颜色变浅,泥沙含量高时呈乳白色,有水生植物时呈红色或红色斑点.