摘要
基于典型畦灌施肥试验观测结果及其模拟结果,对比分析利用混合数值解法和Roe有限体积法分别求解一维畦灌施肥地表水流与溶质运移过程控制方程在数值稳定性与收敛性、计算精度与效率上的差异,验证混合数值解法的计算性能与模拟效果。结果表明,混合数值解法比Roe有限体积法表现出更佳的数值稳定性和收敛性,产生的水平衡误差和平均相对误差较低,同样度量环境下的计算效率提高2.5倍以上。基于混合数值解法的一维畦灌施肥地表水流与溶质运移耦合模拟方法可明显增强数值计算的稳定性和收敛性,有效提高计算精度和效率,为开展畦灌施肥系统设计与评价提供了有效的数值模拟工具。
In this accompanying study,we compare and analyze the differences in stability,convergence,precision and efficiency resulting from the use of two methods in the solution of the one-dimensional model for coupling surface water flow with solute transport for border fertigation（1-DMCSWFSTBF）.The first method is the hybrid numerical method,while the second one is the Roe finite volume method.Results show that the hybrid numerical method produces better numerical stability and convergence compared to the Roe finite volume method.Under the same circumstances of measurement,the former method is 2.5 times more computationally effective than the latter one,and the corresponding average relative error and water balance error are also improved.Thus,1-DMCSWFSTBF based on the hybrid numerical method can significantly increase the computational stability and convergence,and can effectively improve the computational precision and efficiency.The model can be used as an effective simulation tool for the design and performance evaluation of border fertigation systems.
出处
《水科学进展》
EI
CAS
CSCD
北大核心
2011年第2期196-202,共7页
Advances in Water Science
基金
国家高技术研究发展计划(863)资助项目(2006AA100210)
国家自然科学基金资助项目(50909100)
中国水利水电科学研究院科研专项项目(节集1038)~~
关键词
畦灌施肥
混合数值解法
稳定性
收敛性
计算精度与效率
border fertigaion
hybrid numerical method
stability
convergence
computational precision and efficiency
