针对当前荆江河段和洞庭湖水系严峻的采砂形势,根据遥感影像和本地区历年水泥产量,采用体积计算公式、水泥产量估算法、采砂船只估算法这3种方法计算荆江河段和洞庭湖水系的年采砂量,并对3种计算结果的误差进行分析。结果表明:2015年荆江河段年采砂量约(2.6～3.0)×107 t,近5 a的采砂量变化较小;洞庭湖区及湘资沅澧四水水系的年采砂量约1.3×108 t,近3 a的采砂量变化较小。本计算结果对于定量估算荆江河段和洞庭湖水系的采砂量,加强采砂管理具有参考价值。
Abstract
In view of the severe situation of sand excavation in Jingjiang River reach (middle of the Yangtze River) and Dongting Lake’s river network, we estimate the annual sand excavation quantity of Jingjiang River reach and Dongting Lake’s river network(mainstream of Xiangjiang River, Zijiang River, Yuanjiang River, and Lishui River) using three methods, namely, volumetric formula, conversion of cement production, and sand mining ships based on remote sensing images in this region. We also analyzed the errors of these three methods as well. Results demonstrate that the annual quantity of sand excavation in the Jingjiang River reach is around (2.6-3.0)×107 t in 2015 with slight changes in the last five years; the annual quantity of sand excavation in the Dongting Lake’s river network is around 1.3×108 t in 2015 with slight changes in the last three years. The estimation above is of importance to the evaluation and management of sand excavation in Jingjiang River reach and Dongting Lake region.
关键词
荆江河段 /
洞庭湖水系 /
采砂量 /
遥感影像 /
误差分析
Key words
Jingjiang River Reach /
Dongting Lake’s river network /
sand excavation quantity /
remote sensing images /
error analysis
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基金
湖南省科技重大专项(2018SK1010);湖南省教育厅优秀青年项目(16B010);河南省自然科学基金青年项目(2018JJ3547)
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