摘要
为准确评价中小城市实际蒸散发(ET),采用物理机制明确的分布式时变增益水文模型(DTVGM)对介休市蒸散发进行模拟,以MOD16A2遥感产品验证分析蒸散发时空分布特征,并探讨了土地利用变化对蒸散发的影响。结果表明,DTVGM在研究区具有良好的适用性,总体模拟效果满足精度要求;介休市多年平均蒸散发量为375.4mm;年内呈现先增大后减小的单峰型分布趋势,主要集中在5~9月,蒸散发量最小和最大月值分别为14.0、71.7mm;多年平均蒸散发量具有较强的空间分异性,呈东南高西北低的变化趋势,不同季节蒸散发量的空间分布差异明显;不同土地利用类型蒸散发,林地>草地>耕地>城乡、工矿、居民用地;同一乡镇,不同土地利用类型对蒸散发的影响有差别;同一土地利用类型在不同乡镇的蒸散发也有差异。
In order to accurately estimate actual evapotranspiration(ET)in small and medium-sized cities,distributed time-variant gain model(DTVGM)with a deterministic physical mechanism was used to simulate ET,and the temporal and spatial distribution characteristics of ET was analyzed by the MOD16 A2 remote sensing products.Meanwhile,it discusses land use changes and their impact on ET.The results show that the DTVGM has good applicability in the research area,and the simulation consequents meet the accuracy requirement.The multi-year average ETin Jiexiu City is 375.4 mm,the variation of seasonal ET presents a single-peak distribution trend,which is first increases and then decreases,and is mainly concentrated in May and September.The minimum and maximum value of monthly ETis 14.0 mm and 71.7 mm respectively.The multi-year average EThas a strong spatial heterogeneity,showing a trend of low change in northwest,high change in southeast,and the spatial distribution of ETin different seasons is distinct.Evapotranspiration of different land-use types is ranked as descending order:forestland,grassland,cultivated land,urban/industrial/residential land.The impact of different land-use types on the ETis different in the same town,while the same land-use type on the ETis different in different towns.
作者
董宇轩
占车生
潘成忠
王会肖
赵茹欣
DONG Yu-xuan;ZHAN Che-sheng;PAN Cheng-zhong;WANG Hui-xiao;ZHAO Ru-xin(College of Water Sciences,Beijing Normal University,Beijing 100875,China;Key Laboratory of Water Cycle and Related Land Surface Processes,Institute of Geographic Sciences and Natural Resources Researches,CAS,Beijing 100101,China)
出处
《水电能源科学》
北大核心
2019年第3期13-16,8,共5页
Water Resources and Power
基金
国家重点基础研究发展计划(2015CB452701)
国家自然科学基金项目(41571019
51779009)