The pattern of flow of lower lock approach is usually complicated due to the influences of the interaction of flow underpoured from different locks . generally , physical model is applied to study the current field for the case of irregular boundaries and complex flow pattern 由于受多线船闸下泄水流相互作用的影响，船闸下游引航道非恒定流流态十分复杂，对于此类有复杂流态的非恒定水流运动问题一般采用物理模型进行研究。
According to the hydraulic property of overflow weirs under steady flow , the flow patterns of overflow weirs were classified into free overfall and submerged overfall , and numerical models for unsteady flow were established to simulate the two flow patterns respectively 摘要为了对保水堰的交替水流进行数值模拟，依据保水堰恒定流情况下的工作特性，将保水堰的水流形态分成堰流和满流两种状态，分别建立保水堰不同流态下的非恒定流数学模型。
Due to objective condition , do n ' t carry on experiments of non - steady flow . so , use the experimental result of steady flow when the water level and discharge is the most unfavorable in the cause of opening sluice gate to study approximately the effect to erosion control 由于试验条件所限，无法进行闸门开启过程中非恒定流阶段的模拟试验，所以，进行了闸门开启过程中最不利水位与流量在恒定流下的模拟试验，以近似研究非恒定流下的冲刷效果及流态。
In the case of computation of invariant flow in the flume , the boundary conditions on bottom and wall of the flumes are managed specially according to the view of wall function method , and the formula about u * is deduced according to the hydraulic characteristic of invariant flow in the flume 在实验水槽恒定流的计算中，根据壁面函数法的基本原理，对槽底及壁面的边界条件做了相关的专门处理；并根据实验水槽恒定流的水力特性，导出了摩阻流速计算公式。
The reliability of the model is proved by the comparison between computation and observation in the following three cases , the distribution of vertical velocity of flow on two dimensional invariant flow , the distribution of vertical velocity of flow and transverse velocity of flow on three dimensional invariant flow in the flume 分别对垂向二维恒定流的垂向流速分布，实验水槽三维恒定流的垂向流速分布与横向流速分布进行了计算，将计算结果与相应的实测资料以及理论结果对比分析，证明了模型的可靠性。
This paper , firstly , presents briefly the basic theories of current water hammer calculation including both water hammer mathematic model and calculative methods ; points out continuity equation not meeting the conditions of steady flow , sin 0 being inherent illogically in current water hammer mathematic model , calculative methods of the equation being scarcely precise , etc , which account for the continuity equation is false in the current water hammer mathematic model 本论文首先简要介绍了当前水击计算的基本理论，包括水击数学模型和计算方法。指出了当前水击数学模型中的连续性方程不能满足恒定流条件、 sin项存在的不合理性等问题，说明当前水击数学模型中的连续性方程是错误的。同时也指出了目前的计算方法也存在不严谨之处。
Based on the technology of simulation cloning , ppisc ( parallel and progressive incremental simulation cloning ) approach was proposed to concurrently analyze alternative scenarios of the numerical simulation of unsteady flow in river networks for flood mitigation operation , which was used to optimize the simulation execution by avoiding unnecessary repeated computation among independent scenarios 摘要针对河网非恒定流设定情景批量仿真中存在大量的重复计算，提出了一种基于仿真克隆技术的并行累进增量克隆仿真方法。
The unsteady . flow theory is used for calculate air flow velocity and one - dimension unsteady convection - diffusion model is used for calculate pollutant concentration ( called unsteady theory model in general , utm ) , and a new tunnel control method based on utm and neural network model is developed 本文首次采用更符合实际情况的隧道气流?维非恒定流理论和污染物浓度?维非恒定对流扩散模型(统称非恒定流理论模型)进行隧道通风控制方法的研究，并提出了一套基于非恒定流理论和神经网络模型的新的隧道通风控制方法。
In the part sea area of the oujiang estuary which has complicated landform , the different ko are adopted in the control equations of flow and salinity process to work out the process of tide level , averaged salinity and the flow field using the invariant flow and the real process of tide level as the boundary conditions . the comparison and analysis among the computed results , the theoretic results and the computed results of two dimensional numeric model in a large area indicate that the model is applicable 以地形复杂的瓯江河口局部海区为例，分别采用给定恒定流以及实际潮流过程作为边界条件，对水流盐度过程采用不同的k _ 0形式进行了计算，给出了潮位过程、平均盐度过程以及流场的逐时计算结果，将计算结果与相应的理论结果、实测资料以及大范围二维数学模型的计算结果进行了验证及细致分析，得到了较为满意的结果。
At the same time , figures involving attribute data about flow field at inlet and outlet downstream or wave motion of water at the downflow head of lock chamber of siyang navigation lock were displayed through gis application system which we developed . according to data of baoying navigation lock acquired by mathematics model , figures about velocities which have the same value , velocities toward cross direction which have the same value and flow field at inlet and outlet upstream were formed . achievement data , space information and attribute information were in connection with figure so as to search for and analysis the information , which is satisfying 同时完成了江苏泗阳船闸下游引航道非恒定流及其改善措施的计算分析研究和宝应船闸上游引航道口门区水流条件计算分析研究，运用gis技术和所设计的gis应用系统对泗阳船闸下游引航道内流场以及下闸首水位波动情况进行信息显示，根据对宝应船闸的计算结果生成上游引航道口门区等流速图、横向流速等值线图和流场图，使计算分析成果数据、空间信息、属性信息与图形显示有机结合，便于查询分析，效果令人满意。
