Self-adaptive Green-Ampt infiltration parameters obtained from measured moisture processes

来源 :Water Science and Engineering | 被引量 : 0次 | 上传用户:WatsonWen
下载到本地 , 更方便阅读
声明 : 本文档内容版权归属内容提供方 , 如果您对本文有版权争议 , 可与客服联系进行内容授权或下架
论文部分内容阅读
The Green-Ampt(G-A) infiltration model(i.e., the G-A model) is often used to characterize the infiltration process in hydrology. The parameters of the G-A model are critical in applications for the prediction of infiltration and associated rainfall-runoff processes. Previous approaches to determining the G-A parameters have depended on pedotransfer functions(PTFs) or estimates from experimental results, usually without providing optimum values. In this study, rainfall simulators with soil moisture measurements were used to generate rainfall in various experimental plots. Observed runoff data and soil moisture dynamic data were jointly used to yield the infiltration processes, and an improved self-adaptive method was used to optimize the G-A parameters for various types of soil under different rainfall conditions. The two G-A parameters, i.e., the effective hydraulic conductivity and the effective capillary drive at the wetting front, were determined simultaneously to describe the relationships between rainfall, runoff, and infiltration processes. Through a designed experiment, the method for determining the GA parameters was proved to be reliable in reflecting the effects of pedologic background in G-A type infiltration cases and deriving the optimum G-A parameters. Unlike PTF methods, this approach estimates the G-A parameters directly from infiltration curves obtained from rainfall simulation experiments so that it can be used to determine site-specific parameters. This study provides a self-adaptive method of optimizing the G-A parameters through designed field experiments. The parameters derived from field-measured rainfall-infiltration processes are more reliable and applicable to hydrological models. The parameters of the GA model are critical in applications for the prediction of infiltration and associated rainfall-runoff processes. Previous approaches to determining the GA parameters have depended on pedotransfer functions (PTFs) or estimates from experimental results, usually without providing optimum values. In this study, rainfall simulators with soil moisture measurements were used to generate rainfall in various experimental plots. Observed runoff data and soil moisture dynamic data were jointly used to yield the infiltration processes, and an improved self-adaptive method was used to optimize the GA parameters for various types of soil under different rainfall conditions. The two GA parameters, ie, the effective hydraulic conductivity and the effective capillary drive at the wetting front, were determined also to describe the relat ionships between rainfall, runoff, and infiltration processes. Through a designed experiment, the method for determining the GA parameters was proved to be reliable in reflecting the effects of pedologic background in GA type infiltration cases and deriving the optimum GA parameters. Unlike PTF methods, this approach estimates the GA parameters directly from infiltration curves obtained from rainfall simulation experiments so that it can be used to determine site-specific parameters. This study provides a self-adaptive method of optimizing the GA parameters through designed field experiments. The parameters derived from field-measured rainfall-infiltration processes are more reliable and applicable to hydrological models.
其他文献
期刊
期刊
由氟哌酸与Fe(Ⅱ)的氯化物合成了组成为FeCl3(NFA)3·5H2O固态配合物,并用元素分析,红外光谱,热重分析的表征了它们的组成和性质.
目的观察氨茶碱联合环磷腺苷葡胺(心先安)治疗病态窦房结综合征的疗效。方法59例病态窦房结综合征患者,停用一切影响心率、心律的药物3d。口服氨茶碱0.1g,3次/d,同时静脉给予
2009年1月13-15日,在中国汽车技术研究中心的碰撞试验室内,海马3运动版轿车接受了C-NCAP的3项碰撞试验.诞生于HI平台的海马3运动型轿车,在海马3轿车基础上添加了一些运动部件
In this study, we investigated the origin of the overland flow roughness problem and divided the current overland flow roughness research into three types, as f
期刊
期刊
期刊
期刊