| 引用本文: | 王敬浪,庞治国,江 威,等.灌区衬砌工程防盐效果遥感评估方法研究[J].灌溉排水学报,2023,42(1):138-144. |
| WANG Jinglang,PANG Zhiguo,JIANG Wei,et al.灌区衬砌工程防盐效果遥感评估方法研究[J].灌溉排水学报,2023,42(1):138-144. |
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| 摘要: |
| 【目的】河套灌区实施了一系列的渠道工程措施来保护渠道，防止渠道渗水，抑制土壤盐渍化，但缺少针对灌区衬砌工程防盐效果的评估研究。本文旨在探究利用卫星遥感技术开展河套灌区渠道衬砌工程防盐效果评估。【方法】收集多时相的Landsat8多光谱卫星遥感影像，采用ISODATA聚类方法自动提取河套灌区内的盐碱地，然后利用空间分析方法生成渠道两侧宽度为d的缓冲区，统计缓冲区内盐碱地面积S,构建盐碱地密度指标φ，得到φ-d关系曲线。【结果】衬砌后的渠道两侧盐碱地面积显著下降，盐碱地面积分布曲线呈阶梯状特征。2013—2016年间，衬砌后的渠道两侧500 m范围内盐碱地面积下降最低49.63%，最高86.81%；1 000 m范围内盐碱地面积下降最低47.95%，最高95.06%；1 500 m范围内，盐碱地面积下降幅度最低54.56%，最高95.68%。土壤质地会影响盐碱地的面积变化，土壤黏粒较低的区域，盐碱地的面积减少更快。【结论】①卫星遥感技术对大范围渠道工程防盐效果开展评估是可行的。②盐碱地的空间分布模式在渠道衬砌后发生变化，由均匀分布转变为聚集性分布。③渠道衬砌工程有效地抑制了盐碱地两侧的土壤盐碱化过程。④土壤质地间接影响工程衬砌的治理效果，土壤黏粒较低的区域，衬砌工程的治理效果越明显。 |
| 关键词: 灌区；渠道衬砌；遥感；盐碱地 |
| DOI：10.13522/j.cnki.ggps.2022036 |
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| Evaluating the Efficacy of Channel Lining in Ameliorating Soil Salinization in Hetao Irrigation District Using Satellite Imageries |
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WANG Jinglang, PANG Zhiguo, JIANG Wei, LI Gendong, ZHANG Xiaohong
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1. China Institute of Water Resources and Hydropower Research, Beijing 100038, China;
2. Inner Mongolia Hetao Irrigation District Water Conservancy Development Center, Bayannur 015000, China
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| Abstract: |
| 【Objective】Most channels in Hetao irrigation district have been linned in attempts to reduce seepage and ameliorate soil salinization, but there is lack of understanding of its efficacy at district scales. This paper is to fill this knowledge gap using remote sensing technologies.【Method】The analysis was based on Landsat8 multispectral satellite imageries, and saline-alkali soils in the irrigation district were automatically extracted using the ISODATA clustering method. A buffer zone wide d on both sides of each channel was identified using a spatial analysis method, saline-alkali area and the salinization index (φ) in which were statistically analyzed.【Result】Saline-alkali soil area decreased significantly on both sides of the channel after the lining, and spatial distribution of the saline-alkali soils is in a trapezoid-shape. From 2013-2016, the salt-alkali soils within the 500m proximal to the channels had reduced from 49.63% to 86.81%, depending on locations, while within the 1 000 m and 1 500 m adjacent to the channels, they had reduced from 47.95% to 95.06%, and from 54.56% and 95.68%, respectively. Soil texture will affect the change of saline-alkali land area, and the area of saline-alkali land decreases faster in the region with low soil clay.【Conclusion】① Satellite remote sensing technology is feasible to evaluate the salt control effect of large-scale channel projects. ② The spatial distribution pattern of saline-alkali land changed from uniform distribution to aggregation distribution after canal lining. ③ The channel lining project effectively inhibited the soil salinization process on both sides of the saline-alkali land. ④ Soil texture indirectly affects the treatment effect of lining engineering. The treatment effect of lining engineering is more obvious in the area with lower soil clay. |
| Key words: irrigation district; channel lining; remote sensing; saline-alkali land |
