项目名称: 河西走廊荒漠绿洲蒸散发空间格局及尺度效应研究
项目编号: No.41301036
项目类型: 青年科学基金项目
立项/批准年度: 2014
项目学科: 天文学、地球科学
项目作者: 李守波
作者单位: 南京信息工程大学
项目金额: 26万元
中文摘要: 在荒漠绿洲区域蒸散发估算研究中,由于下垫面的异质性,在不同下垫面的过渡区,蒸散发难以被准确模拟,而且不同分辨率会有不同的结果。这导致在不同空间尺度上对蒸散发进行分析时,各土地利用类型的蒸散发和绿洲的蒸散格局都会有所差异。因此,本项目拟以生态水文学的尺度效应理论为出发点,以河西走廊典型绿洲:石羊河和黑河绿洲为研究区,使用三种遥感数据源,通过能量平衡模式模拟蒸散发,并进行检验和交叉检验,并重采样生成13种不同空间分辨率的蒸散数据,从而分析不同尺度蒸散发的空间格局;并结合由卫星资料获取的土地利用数据,研究蒸散发尺度与土地利用类型之间的关系,探讨非均质下垫面蒸散发研究的最佳空间分辨率,及土地利用类型交界区域蒸散的修正方法,同时分析生长季内不同时相绿洲蒸散发空间尺度效应,探讨蒸散发尺度效应的驱动因子。本研究将有助于复杂下垫面蒸散模拟精度的提高,并为蒸散发尺度转换提供理论依据,加深对绿洲耗水的理解。
中文关键词: 荒漠绿洲;蒸散发;尺度效应;遥感监测;能量平衡
英文摘要: Due to the complexity of land surface in desert oasis, the evapotranspiration(ET) is difficult to estimate on the transition region of different land surface condisions and the results depends on the resolution of data sourses. It will lead to the different ET results on same landuse type and different spacial pattern of oasis ET when we use different scales to analyse. Therefore, based on the scale effect theory of ecohydrology, we choose two typical desert oases (Heihe oasis and Shiyang oasis) in Hexi corridor as the study area, modelling evapotranspiration using three different kinds of remote sensing data sources through energy balance method. The results will be validated by ground observation and cross-validation. The ET results will be resampled into 13 different scales to analysis different spacial pattern of oases. Associated with land use data from remote sensing, we can study the relationship between evapotranspiration scale and land use type, the optimal spatial resolution of ET recearch on heterogeneous land surface, and the method to correct the evapotranspiration on the edges of land use types. And we also can study the similarity and difference on ET scale effects of different months during the growing season to discuss the driving factors of scale effect. This research will improve the accuracy
英文关键词: Desert Oasis;Evapotranspiration;Scale Effect;Remote Sensing Monitoring;Energy Balance