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中文摘要：
通过流域水循环中各要素同位素含量的测定，扩大建模信息利用量，增加确定模型参数所需信息，提高参数可识别性，可在一定程度上减少参数的不确定性。以仅有两个参数且物理意义明确的Philip入渗模型为例，利用同位素信息确定Philip入渗模型参数稳定入渗率，并通过室内降雨入渗实验来检验同位素信息确定模型参数结果。结果表明，利用同位素信息确定的Philip入渗模型稳定入渗率与实测值接近。氢氧稳定同位素的分析精度对利用同位素信息确定模型参数结果有一定影响。
英文摘要：
Uncertainties associate with parameter estimation in modeling the water cycle can be reduced to a certain extent by expanding the utilization of modeling information and increasing the amount of data for parameter estimation.This is done through collecting and using the isotopic composition of water within the water cycle in model identification.In this study,the isotopic information is used to estimate the steady-state infiltration rate in Philip′s two-parameter equation and the estimated parameters are validated through the indoor experimental data.The result shows that the estimated steady-state infiltration rate is in good agreement with the measurement.Analytical precisions of hydrogen and oxygen stable isotopes will have some impact on parameter estimation using isotopic information.
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