| Cite this article: | 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,0,():-. |
| 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,0,():-. |
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| Study on Remote Sensing Evaluation Method of Salinization Prevention Effect of Lining Engineering in Irrigated Area |
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WANG Jinglang1,2,3, PANG Zhiguo1,2,3, JIANG Wei1,2,3,4, LI Gendong5, ZHANG Xiaohong5
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1.China Institute of Water Resources and Hydropower Research;2.Research Center on Flood &3.Drought Disaster Reduction of the Ministry of Water Resources;4.3.Postdoctoral workstation of China Reinsurance (Group) Corporation;5.Inner Mongolia Hetao Irrigation District Water Conservancy Development Center
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| Abstract: |
| 【Objective】At present, hetao irrigation district has implemented a series of channel engineering measures to protect the channel, prevent water seepage and inhibit soil salinization, but there is a lack of an evaluation method for the salt prevention effect of the lining engineering in the irrigation district. This paper aims to explore the application of satellite remote sensing technology to evaluate the salt prevention effect of channel lining in Hetao irrigation area.【Method】Multi-temporal Landsat8 multi-spectral satellite remote sensing images were collected, and the saline-alkali land in hetao irrigation area was automatically extracted by ISODATA clustering method. Then, a buffer zone with d width on both sides of the channel was generated by spatial analysis method. The area S of saline-alkali land in the buffer was calculated, and the density index φ was constructed, and the φ-d relation curve was obtained.【Result】The results showed that the saline-alkali land area on both sides of the channel decreased significantly after the channel lining, and the saline-alkali land area distribution curve showed a step-like feature. 【Conclusion】(1) Channel lining can effectively inhibit the soil salinization process on both sides of saline-alkali land. From 2013 to 2016, the saline-alkali land area within 500m on both sides of the lined channel decreased by 49.63% and 86.81%, respectively. In the range of 1000m, the saline-alkali land area decreased by 47.95% and 95.06%, respectively. In the range of 1500m, the saline-alkali land area decreased by 54.56% and 95.68% respectively. (2) It is feasible to evaluate the salt prevention effect of large-scale channel engineering by satellite remote sensing technology. (3) before and after lining, φ-d relation curve changes, indicating that the spatial distribution pattern of saline-alkali land changes from the original uniform distribution to the present concentrated distribution. |
| Key words: Irrigation district; Channel lining; Remote sensing; Saline-alkali land |
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