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  main channel
The flow in the main channel and in the ducts in the side walls is described by the quasi-one-dimensional gas-dynamic equations investigated qualitatively in [2] and verified experimentally in [3].
      
The main channel for the pyrolysis of (≡Si-O)2Si(OH)(CH3) groups is their decomposition with the abstraction of a methane molecule.
      
The excitation from the ground state by a small fraction of hot electrons is expected to be the main channel of populating the Ar XVII levels.
      
The assumption is made that inelastic collisions of He++ ions with metastable helium atoms provide the main channel of charge exchange of these ions due to the reaction He+++Hem→ He+*+He0+.
      
Radiative recombination of electron-hole pairs was established to be the main channel of the intrinsic PL excitation at 4.2 eV.
      
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  main canal
The paper concerns a regional prediction of the development of landslides in the area of a large main canal which is designed for moving part of the waters of the Siberian rivers to the Aral Sea.
      
To investigate this question, we examined water use and productivity at four different scales: field scale, meso scale, main canal command scale, and subbasin scale using the water accounting methodology.
      
Impact of trichloroethylene contaminated groundwater discharged to the main canal and Indian River Lagoon, Vero Beach, Florida
      
Investigations centred on the water issues and areas irrigated by the project's Right Bank main canal during commissioning.
      
The advantage of reorganization is illustrated through the economic assessment of the "Reduccion Main Canal".
      
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A fluvial computation formula was developed by analyzing the measurements of the main irrigative channel.The formula has time sequence characteristic.By using the formula we computed the fluvial processes quantitatively for the past several years and predicted the fluvial processes tendencyunder the conditions of the reality and the regulation of the main channel

本文利用总干渠实测水沙资料建立了具有时序特征的渠床冲淤变形计算公式。对总干渠近年来的渠道冲淤进行了定量计算,并对渠道在现状和整治两种条件下的演变趋势进行了预测。

In order to study transferring water problems during ice period for the main channels of Middle Line scheme of Diversion Project from South to North,through analysis of ice conditions from field data of the Daqinghe River,verification calculations for water stages and water temperatures,calculations and analyses of effect of ice conditions were performed .The study results show that the established 1 D unsteady mathematical model simulating hydraulics and water temperature is feasible ,the accuracy of verification...

In order to study transferring water problems during ice period for the main channels of Middle Line scheme of Diversion Project from South to North,through analysis of ice conditions from field data of the Daqinghe River,verification calculations for water stages and water temperatures,calculations and analyses of effect of ice conditions were performed .The study results show that the established 1 D unsteady mathematical model simulating hydraulics and water temperature is feasible ,the accuracy of verification is satisfied receptable.River roughness without ice cover in the observed river reaches is 0.02-0.03,and it reaches 0.03-0.04 during the period of ice cover.If the ice conditions were not considered,the water levels in the observed river reaches would be reduced by 0.1-0.4 m and the discharge capacities,increased by 30%-65%.Comparative analysis of ice condition between the main channels and Daqinghe river show that during water transfer in winter with ice conditions,bank ice and battom ice may not be considered,stable static ice cover could hardly be formed ,and the occurrence and existence of ice fragile,ice floe,ice jam and ice dam would effect channel roughnesses,water stages and capacities of water transfer to some extent.

为研究南水北调中线方案总干渠冰期输水问题,通过对大清河系冰情分析、水位水温验证计算及冰情影响计算表明:建立的一维非恒定水力学和水温数学模型可行且验证精度较高;观测河段无冰盖时糙率为0.02~0.03,有冰盖时糙率增加到0.03~0.04;假定不出现冰情,观测河段水位将下降0.1~0.4 m ,过流能力将提高30% ~65% 。总干渠与大清河冰情对比分析表明:冬季冰期输水期间,总干渠可以不考虑岸冰和底冰,并且难以形成静态稳定冰盖,水内冰、水面流冰、冰塞和冰坝的出现和存在将不同程度上影响总干渠的糙率、水位和输水能力。

A depth averaged mathematical model is applied to simulate the flood flow and the deformation of river bed for a crossing engineering is South to North Water Transfer Project of China. A procedure to treat moving boundary is adopted in this model. The model is calibrated by the data of typical flood flow.

本文对南水北调总干渠与河流交叉工程进行了洪水与河床变形的平面二维数值模拟.模型采用水边界全区自动跟踪方法、考虑了交叉工程附近的局部冲刷并借助河床演变分析成果,较好地进行了特征洪水验证.通过计算给出了自然状态、设计方案时的特征洪水流场、工程附近的壅水及河床冲刷成果,根据预测分析还提出了更为合理的工程修改方案

 
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