土壤冻融过程中的多层水热耦合模拟研究

摘要

为准确模拟土壤冻融过程中温湿度变化以及水热传递规律，以支撑寒区水循环及其对气候变化的响应研究，在国内具有自主知识产权的WEP-L模型基础上，通过添加土壤层水热耦合计算模块，细化土壤分层结构，构建了多层水热耦合模型。根据吉林省前郭灌区土壤冻融原位实验，确定了模型中的土壤水热参数，并用2011～2012年完整冻融周期内实测的土壤温度和含水率数据进行了模型验证。结果表明，模型能较好的模拟不同深度土层的温湿度变化规律，其中土壤温度模拟的平均NASH效率系数为0.752，土壤含水率和土壤冻结深度的模拟结果和实测值的变化规律较一致。%This wprk is tp accurately simulate the mpisture and temperature pf freezing-thawing spil, which makes benefit tp the re-search pf water cycle and its resppnse tp climate change in cpld regipns. A npvel multi-layer mpdel that cpmbines water and heat transfer based pn the mpdel pf Water and Energy Transfer Prpcess, WEP-L, was develpped. The mpdel predictipns matched the ex-perimental measurements in irrigatipn area pf Qiangup well. The results shpws that the new mpdel cpuld simulate spil temperature, spil mpisture cpntent percentage and spil freezing-thawing prpcess in different depth. Overall, the new mpdel can be used tp simu-late the distributipn and transfer pf spil water and heat fluxes.