摘要
利用SEBAL模型,基于MOD IS数据计算得到了石羊河流域2004年不同时期的日蒸发蒸腾量,分析了流域内蒸发蒸腾量的空间分布特征及年内不同时期的变化特征,并从不同植被覆盖区选取地表比辐射率、反照率、动力学粗糙度和植被覆盖度4个参数对SEBAL模型进行了灵敏度分析。结果表明:石羊河流域蒸发蒸腾量的区域地带性分布规律非常明显,各时期植被覆盖区的蒸发蒸腾量明显大于裸地及沙漠区,上游山区蒸发蒸腾量为全年最大,夏季日蒸发蒸腾量达5 mm以上,下游沙漠区蒸发蒸腾量最小,春、冬季部分区域日蒸发蒸腾量在0.5 mm以下。经灵敏度分析,SEBAL模型对不同植被覆盖区陆面参数的灵敏度均相对较小,说明该模型计算结果稳定,可用于不同植被覆盖区实际蒸发蒸腾量的模拟计算。
Evapotranspiration is a very important part of water circulation.It plays key role in the process of atmosphere,hydrosphere and biosphere.Estimating it correctly is very important for understanding large-scale energy and water balance.This study used SEBAL model and combined remote image MODIS to estimate the daily evapotranspiration of Shiyang River Basin in 2004.Spatial distribution and characters of evapotranspiration at different period were analyzed.We selected four parameters as surface emissivity,albedo,surface roughness and vegetation cover fraction to analyze the sensitivity of daily evapotranspiration.The results showed that evapotranspiration has obvious distributing rules in Shiyang River.It is larger in upriver and vegetation covered area.According to the result of sensitivity analysis,the sensitivity of the parameters is relative small,thus SEBAL model is stable.Therefore,the model can be used to simulate evapotranspiration of area with different vegetation cover fraction.
出处
《水资源与水工程学报》
2010年第6期76-80,共5页
Journal of Water Resources and Water Engineering
基金
国家自然科学基金(50879033)
高等学校博士学科点专项科研基金项目(20090211110025)资助
作者简介
作者简介：马宏伟（1985-），男，甘肃会宁县人，在读硕士生，主要从事水文水资源与气候变化研究。
通讯作者：王乃昂（1962-），男，山东郓城人，教授，博士生导师，研究方向为：气候变化与水文响应，环境变迁与历史地理。
