摘要
遥感技术作为根据电磁波理论发展起来的一种新型探测手段,具有非接触观测、测量成本低、覆盖范围广等优势,为测算径流量开辟了新思路。基于覆盖漓江流域2018年8月至2019年7月的Sentinel-1 SAR遥感影像,影像每12 d获得一组,共29组58景,采用人工阈值分割法提取漓江沿线水体平均河宽,将其分割为8个河段,与大溶江、桂林、阳朔3个相应水文站的实测径流数据进行一元回归分析,建立平均河宽-流量多项式回归方程。对比各河段建模效果,得到各测站对应的建模效果最好河段,其R^2分别为0.92、0.94和0.88。对其经验公式进行验证,径流反演平均误差最小为10%,在河道较宽、地形较缓的河段具有较好应用效果,能够实现基于遥感技术的河道流量反演。
As a new type of detection method developed based on the theory of electromagnetic waves, remote sensing technology has the advantages of non-contact observation, low measurement cost and wide coverage, which has opened up new ideas for the measurement of river discharge. Based on the Sentinel-1 SAR remote sensing image covering the Lijiang River Basin from August 2018 to July 2019, the image was obtained every 12 days for a total of 29 groups of 58 scenes. The artificial threshold segmentation method was used to extract the average river width of the water body along the Lijiang River. It is divided into 8 river sections, and the river discharge data from three corresponding hydrological stations of Darong River, Guilin and Yangshuo are used for one-dimensional regression analysis to establish the average river width-discharge regression equation. Comparing the modeling effect of each river section, the best modeling section corresponding to each station is obtained, with R^2 of 0.92, 0.94 and 0.88 respectively. To verify its empirical formula, the average deviation of river discharge inversion is at least 10%. It has a good application effect in the river section with wider river channel and slower terrain. It can realize the river discharge inversion based on remote sensing technology.
作者
陈思雨
李继清
谢宇韬
田雨
CHEN Siyu;LI Jiqing;XIE Yutao;TIAN Yu(School of Water Conservancy and Hydropower Engineering,North China Electric Power University,Beijing 102206,China;China Institute of Water Resources and Hydropower Research,Beijing 100038,China)
出处
《人民珠江》
2020年第5期116-122,共7页
Pearl River
基金
国家重点研发计划项目(2017YFC0405906)。
