| 本文已被：浏览 58次 下载 0次 |
|
|
|
| 近30年闽江下游河道演变特征及成因分析 |
|
何立滢1, 周聂1, 盛晟1, 胡朝阳2, 陈华1, 许崇育3
|
|
1.水资源工程与调度全国重点实验室武汉大学;2.福建省水利水电勘测设计研究院;3.Department of Geosciences,University of Oslo,PO Box Blindern, Oslo,Norway
|
|
| 摘要: |
| 河流形态演变密切关系到区域社会经济发展和生态环境稳定。以闽江下游为研究对象，采用神经网络算法解译1990—2021年遥感图像中河道信息，分析水体、沙洲和边滩面积变化和河道摆动情况，探究河道形态演变特征与成因。结果表明：构建的神经网络算法在遥感水体提取中具有很好的可行性，水体提取平均准确率达95%以上，平均查全率达90%以上；全域上看，近30年闽江下游沙洲和边滩面积减少，1990—2000年河道以展宽为主，2000—2011年河道以收缩为主，而后河道形态较为稳定；分段上看，闽清闽侯段洲滩减少，河道拓宽；北港段洲滩被占用，河道收缩；南港段边滩面积减少，河道展宽；马尾段河道形态相对稳定。闽江下游河道形态受水库运行、采砂活动、地质因素、工程建设和潮流作用等多因素影响。研究成果可为类似河流演变研究和规划保护提供借鉴。 |
| 关键词: 遥感解译 河道形态 河道摆动 感潮河段 闽江下游 人类活动 |
| DOI： |
| 分类号:TV147 |
| 基金项目:国家重点研发计划(项目编号：2022YFC3002701) |
|
| A comprehensive analysis of the channel morphological changes and causes of the lower Min River in recent 30 years |
|
HE Li-ying1, ZHOU Nie1, SHENG Sheng1, HU Zhao-yang2, CHEN Hua1, XU Chong-yu3
|
|
1.State Key Laboratory of Water Resources Engineering and Management,Wuhan University;2.Fujian Provincial Investigation,Design ＆ Research Institute of Water Conservancy ＆ Hydropower;3.Department of Geosciences,University of Oslo,PO Box Blindern, Oslo,Norway
|
| Abstract: |
| River morphology is crucial for natural environment and economy. This study uses neural network algorithm to extract water body of the Min River based on satellite images from 1990 to 2021. This study also investigates the morphological evolution characteristics and causes of the tidal reach by analyzing the area of water, beach and sandbar. The results show that the intelligent interpretation algorithm of water body based on neural network is feasible with the average accuracy rate reaches 95% and the average recall rate reaches 90%. In the lower reaches of Min River, the sandbars and beaches has shrunk over the past 30 years. And the river channel widened from 1990 to 2000 but contracted from 2000 to 2011, and then stabilized in recent ten years. In the Minqing-Minhou reach, the beach scoured and the river channel widened. In the Beigang reach, the river channel narrowed and some of beach are occupied. In the Nangang reach, the river channel widened and oscillated due to the decrease of beach, and the sandbar first scoured and then silted. The Mawei reach’s channel morphology is relatively stable. Many factors influence the morphological evolution such as reservoir, sand mining activities, geology, engineering construction, and the tidal action. This study can provide reference for the morphology evolution and protection of other tidal rivers. |
| Key words: Remote sensing interpretation Channel morphology River swing Tidal reach Lower reaches of Min River Human activity |
