PDF(Pubmed)
Abstract：
The Egyptian Ministry of Water Resources and Irrigation launched in 2020 the national project to rehabilitate the canals network to rationalize the use of water resources to face the scarcity problems. The aim of study is to evaluate the impact of canal rehabilitation on the performance of irrigation water delivered laterally to Mesqa\'s and longitudinally to the end of canal. Qaraqoul Canal et al.-Mallah Area, Alexandria, Egypt, was modeled using Hydrologic Engineering Center\'s-River Analysis System (HEC-RAS) to simulate water levels in the canal before and after rehabilitation using four discharge scenarios: 1.82, 3.7, 2.2, 7.87 m3/s. The calibration before rehabilitation shows that HEC-RAS simulated water levels corresponding to a discharge of 2.2 m3/s were in a good agreement with the actual field measured water levels. HEC-RAS results demonstrated that rehabilitation hydraulically improved the efficiency and performance of water conveyed by the canal. On the other hand, second scenario can be considered as suitable to keep water to reach the canal downstream with minimum suitable discharge, providing the need of two emergency pumps at last two branch canals called Mesqa\'s. An ideal cross-section is also simulated using HEC-RAS which produced an efficient alternative with 40% less cost than the constructed alternative.
摘要：
埃及水资源和灌溉部于2020年启动了国家项目，以恢复运河网络，以合理利用水资源来应对稀缺问题。研究的目的是评估运河修复对横向输送到Mesqa's和纵向输送到运河末端的灌溉水性能的影响。QaraqoulCanal等人。-马拉地区,亚历山大,埃及,使用水文工程中心的河流分析系统（HEC-RAS）进行建模，以使用四种排放方案：1.82、3.7、2.2、7.87m3/s来模拟运河修复前后的水位。修复前的校准表明，对应于2.2m3/s流量的HEC-RAS模拟水位与实际现场测量水位非常吻合。HEC-RAS结果表明，修复液压可以提高运河输送水的效率和性能。另一方面,第二种情况可以被认为是适合保持水以最小的适当流量到达下游的运河，在最后两个名为Mesqa's的支管中提供两个应急泵的需求。还使用HEC-RAS模拟了理想的横截面，该方案产生了有效的替代方案，成本比构建的替代方案低40％。
