...
  • 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>Irrigation & Drainage Systems Engineering >Slope Effects on the Pressure Head Profile Patterns of Sprinkler Irrigation Laterals, I. Theoretical Analysis
【24h】

Slope Effects on the Pressure Head Profile Patterns of Sprinkler Irrigation Laterals, I. Theoretical Analysis

机译：坡度对喷灌侧压头剖面图案的影响，I。理论分析

获取原文
           
页面导航
  • 摘要
  • 著录项
  • 相似文献
  • 相关主题

摘要

The pressure head profile of an irrigation lateral is a function of the hydraulic and geometric characteristics of the lateral and its slope. Slope effects on pressure variability along a lateral are typically limited. However, for a lateral with a spatially invariant parameter set well-defined relationships can be discerned between lateral slopes and the spatial patterns of the lateral pressure profiles. Thus, a comprehensive understanding of these relationships can be useful in the evaluation of lateral hydraulic simulation models and design recommendations. Existing studies have examined slope effects on the locations of pressure head extreme, along a lateral, in the context of hydraulic design of laterals. This paper presents a comprehensive analysis of slope effects on lateral pressure head profile patterns. The monotonic properties, with respect to distance from inlet, of lateral slope and friction slope profiles coupled with the pressure slope equation are used here to determine the full range of variation of lateral pressure head profile patterns as a function of lateral slope. Overall, the analysis show that the pressure profile patterns of a lateral, and possibly the locations of the pressure extreme along the lateral, can be determined by comparing the negative of the lateral slope with the corresponding friction slope at the upstream and/or downstream ends of the profile. The results also show that the full range of variation of the pressure profile patterns of a lateral, as affected by slope, consists of three distinct categories. These include a profile pattern that is increasing or decreasing, with distance from the inlet, over the entire length of the lateral and one that combines both trends within the length of the lateral. The relationships between lateral slopes and pressure profile patterns, deduced here through theoretical analysis, will be evaluated in a companion paper based on simulations.
机译：灌溉支管的压头曲线是支管及其斜率的水力和几何特性的函数。斜坡对沿横向压力变化的影响通常受到限制。但是，对于具有空间不变参数集的侧面，可以在侧面坡度和侧面压力分布的空间模式之间分辨出明确定义的关系。因此，对这些关系的全面理解可能对评估侧向水力仿真模型和设计建议很有用。现有研究已经研究了在支管的水力设计的情况下，沿支管的极端情况下，压力对极端压力头位置的影响。本文介绍了斜率对侧压头轮廓模式的影响的综合分析。相对于距入口的距离，横向坡度和摩擦坡度轮廓与压力坡度方程相结合的单调特性在这里用于确定横向压力头轮廓图案随横向坡度变化的全部范围。总体而言，分析表明，可以通过将横向斜率的负值与上游和/或下游端的相应摩擦斜率进行比较，来确定横向压力分布模式以及可能沿着横向的极端压力位置的个人资料。结果还表明，受坡度影响的侧向压力分布图变化的全范围包括三个不同的类别。其中包括一个轮廓图案，该轮廓图案在距支管的整个长度上都随着距入口的距离的增加或减小，并且将支管在支管的长度内的两种趋势组合在一起。在此处通过理论分析得出的横向斜率与压力分布模式之间的关系，将在模拟的基础上在随附的论文中进行评估。

著录项

相似文献

  • 外文文献
  • 中文文献
  • 专利
获取原文

客服邮箱：kefu@zhangqiaokeyan.com

京公网安备：11010802029741号 ICP备案号：京ICP备15016152号-6 六维联合信息科技 (北京) 有限公司©版权所有

  • 客服微信

  • 服务号