Effect of the Matrix Dam in the Paddy Field Drainage Ditch on Water Purification Based on the Physical Model Test

Haisheng Liu, Hao Yang, Honghua Shang, Fangli Su, Changzhi Ji and Jing Cheng
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Haisheng Liu: Zhejiang Tongji Vocational College of Science and Technology, 418 Gengwen Road, Hangzhou 311231, China
Hao Yang: College of Water Conservancy, Shenyang Agricultural University, 120 Dongling Road, Shenyang 110866, China
Honghua Shang: Hangzhou Zhenshang Environmental Science and Technology Co., Ltd., Hangzhou 310018, China
Fangli Su: College of Water Conservancy, Shenyang Agricultural University, 120 Dongling Road, Shenyang 110866, China
Changzhi Ji: China Three Gorges Construction Engineering Corporation, 1688 Binsheng Road, Hangzhou 310052, China
Jing Cheng: Zhejiang Tongji Vocational College of Science and Technology, 418 Gengwen Road, Hangzhou 311231, China

Sustainability, 2022, vol. 14, issue 14, 1-12

Abstract: (1) Setting a matrix dam in the paddy field drainage ditch has been recognized as an effective method to lower the velocity of water discharged from a paddy field in the drainage ditch, which can improve the purification efficiency of the drainage ditch for nitrogen and phosphorus pollutants, but the specific placement and thickness of the matrix dam have not been supported due to the insufficient research results. (2) Three thicknesses of the matrix dam were set in three locations of the physical model of the drainage ditch. By measuring the flow rate and water level in different sections, the optimal layout location and thickness of the matrix dam were determined. (3) When the matrix dam was located in section 1-1, the flow rate from sections A-A to C1-C1 was reduced by 0.159 m/s; when the matrix dam was located in section 2-2, the flow rate was reduced by 0.331 m/s; when the matrix dam was located in section 3-3, the flow rate was reduced by 0.360 m/s. (4) We concluded that the optimal design position of the matrix dam was section 3-3, 9.2 m from the entrance of the water flume, and the optimal design thickness was 0.3 m.

Keywords: matrix dam; layout location; thickness; flow rate; water level; water purification (search for similar items in EconPapers)
JEL-codes: O13 Q Q0 Q2 Q3 Q5 Q56 (search for similar items in EconPapers)
Date: 2022
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