• 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>Rural and Environmental Engineering >Transient Released Water Flow Advancing on an Infiltrative Dry Bed Channel
【24h】

Transient Released Water Flow Advancing on an Infiltrative Dry Bed Channel

机译：渗透性干床通道上的瞬态释放水流前进

获取原文
获取原文并翻译 | 示例
           
页面导航
  • 摘要
  • 著录项
  • 相似文献
  • 相关主题

摘要

In many Asian paddy field areas, continuous irrigation schemes are often changed to rotational ones when water deficits become serious. In rotational irrigation, released water advances on a dry bed channel, because the channel bottom dries up duringthe waiting period for the next water supply. The hydraulic characteristics of released water flow are similar to those of the irrigation advance problem. Although numerous methods have been proposed to solve the problem, they cannot be applied directlyto released water flow. A new calculation method devised in this study has the same structure as that of the two-step Lax-Wendroff scheme, and adjusts the tip's infiltration rate by monitoring the whole mass balance. Using this method, the arrival time and arrival rate of released water are examined numerically. These indexes are dependent on many factors, and several factors closely related to O & M are selected to examine their influence. The selected factors are roughness coefficient, infiltration rate, supply duration, and inflow rate. These results are applied to a model irrigation system to compare the conveyance efficiency of continuous irrigation schemes with that of rotational ones, As a result, the following facts are noted. First, a rotational irrigation scheme is advantageous when water deficit is serious. Second, a regulating reservoir can improve con: veyance efficiency considerably.
机译：在许多亚洲稻田地区，当缺水严重时，连续灌溉方案通常会改为轮作灌溉方案。在旋转灌溉中，释放的水在干床通道上前进，因为在等待下一次供水的等待时间内通道底部变干了。释放的水流的水力特性类似于灌溉提前问题。尽管已经提出了许多方法来解决该问题，但是它们不能直接应用于释放的水流。本研究中设计的一种新的计算方法与两步Lax-Wendroff方案具有相同的结构，并通过监视整个质量平衡来调整尖端的渗透率。使用这种方法，数值检查释放水的到达时间和到达率。这些指标取决于许多因素，并选择了几个与运维密切相关的因素来检查其影响。选择的因素是粗糙度系数，渗透率，供应持续时间和流入率。将这些结果应用于模型灌溉系统，以比较连续灌溉方案和轮作方案的输送效率。结果，注意到以下事实。首先，当缺水严重时，轮灌方案是有利的。其次，调节水库可以大大提高运输效率。

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