
The Changes of Lakes above 1 km2 in China Since 2011
Zhan-ling WANG, Yin CAO, Hong-li ZHAO, Yun-zhong JIANG, Jie LI, Hao-miao GUO, Xiang-long LI
The Changes of Lakes above 1 km2 in China Since 2011
In recent years, lakes in different regions have changed in different types and degrees due to the increasing influence of climate change and human activities. This paper uses RS and GIS technology, based on the results of the first water conservancy survey and the 2019 GF-1 time series remote sensing image, the water body is extracted through object-oriented multi-scale segmentation combined with the bimodal threshold method, and visual observation is used in the secondary calibration. Interpretation to determine the type of lake change, and then derive the water area to quantitatively evaluate the lakes with an area of more than 1 km2 that have changed, and perform statistical analysis on the type, level and quantity of the changes.The results showed that: ① About 814 lakes across the country have undergone unfavorable changes. The main types of changes include shrinkage, cultivated land encroachment, wetland encroachment, breeding land encroachment, other encroachment, accounting for 28.3% of the total number of lakes. ② The spatial difference of change types is obvious, the lakes in the north are mostly dried up and shrunk, the lakes in the south are mostly occupied by paddy fields and aquaculture. ③ Expansion lakes are mainly concentrated on Tibet and Qinghai.The research results provide the latest basic data for lake change monitoring and management.
water conservancy survey / time series remote sensing image / visual interpretation / quantitative evaluation / types of lake changes {{custom_keyword}} /
Tab.1 Types of lake changes and classification standards表1 湖泊变迁类型及划分标准 |
划分等级 | 1-萎缩 | 2-耕地侵占 | 3-湿地侵占 | 4-养殖地侵占 | 5-其他侵占 | 6-面积扩张 |
---|---|---|---|---|---|---|
>95% | 1-1 干涸 | 2-1 全部侵占 | 3-1 全部侵占 | 4-1 全部侵占 | 5-1 全部侵占 | |
70%~95% | 1-2 重度萎缩 | 2-2 重度侵占 | 3-2 重度侵占 | 4-2 重度侵占 | 5-2 重度侵占 | |
40%~70% | 1-3 中度萎缩 | 2-3 中度侵占 | 3-3 中度侵占 | 4-3 中度侵占 | 5-3 中度侵占 | |
10%~40% | 1-4 轻微萎缩 | 2-4 轻度侵占 | 3-4 轻度侵占 | 4-4 轻度侵占 | 5-4 轻度侵占 |
Tab.2 Statistics of single transition types and numbers表2 单一变迁类型及个数统计表 |
等级 | 1-萎缩 | 2-耕地侵占 | 3-湿地侵占 | 4-养殖地侵占 | 5-其他侵占 | 6-面积扩张 | |||||
---|---|---|---|---|---|---|---|---|---|---|---|
个数 | 占比/% | 个数 | 占比/% | 个数 | 占比 | 个数 | 占比/% | 个数 | 占比/% | 个数 | |
95%以上 | 72 | 9.7 | 86 | 11.5 | 25 | 3.4 | 38 | 5.1 | 15 | 2.0 | 202 |
70%~95% | 80 | 10.7 | 19 | 2.5 | 9 | 1.2 | 18 | 2.4 | 6 | 0.8 | |
40%~70% | 76 | 10.2 | 20 | 2.7 | 4 | 0.5 | 15 | 2.0 | 8 | 1.1 | |
10%~40% | 183 | 24.5 | 23 | 3.1 | 5 | 0.7 | 36 | 4.8 | 8 | 1.1 | |
总数 | 411 | 55.1 | 148 | 19.8 | 43 | 5.8 | 107 | 14.3 | 37 | 5.0 | 202 |
Tab.3 Type and number of compound transition statistics表3 复合变迁类型及个数统计表 |
个数 | 1-1 | 1-2 | 1-3 | 1-4 | 2-2 | 2-3 | 2-4 | 3-2 | 3-3 | 3-4 | 4-2 | 4-3 | 4-4 |
---|---|---|---|---|---|---|---|---|---|---|---|---|---|
2-3 | 3 | ||||||||||||
2-4 | 3 | 5 | 2 | 3 | |||||||||
3-2 | 5 | ||||||||||||
4-2 | 1 | 1 | |||||||||||
4-3 | 1 | 1 | 1 | ||||||||||
4-4 | 1 | 1 | 1 | 3 | 4 | 1 | |||||||
5-3 | 1 | 1 | 2 | 1 | 1 | 1 | |||||||
5-4 | 6 | 3 | 2 | 2 | 1 | 1 | 1 | 2 | 1 | 1 |
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