Effect of Co-Use of Fly Ash and Granular Polyacrylamide on Infiltration, Runoff, and Sediment Yield from Sandy Soil under Simulated Rainfall
Coal fly ash (FA) and polyacrylamide (PAM) are two common amendments for improving hydraulic properties of sandy soil. However, their interaction effect on infiltration-runoff processes in sandy soil has been scarcely reported. In this study, FA and anionic PAM granules were mixed thoroughly with a...
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MDPI AG
2020-03-01
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| Series: | Agronomy |
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| Online Access: | https://www.mdpi.com/2073-4395/10/3/344 |
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| author | Kai Yang Zejun Tang Jianzhang Feng |
| author_facet | Kai Yang Zejun Tang Jianzhang Feng |
| author_sort | Kai Yang |
| collection | DOAJ |
| description | Coal fly ash (FA) and polyacrylamide (PAM) are two common amendments for improving hydraulic properties of sandy soil. However, their interaction effect on infiltration-runoff processes in sandy soil has been scarcely reported. In this study, FA and anionic PAM granules were mixed thoroughly with a 0−0.2 m sandy soil layer at FA rates of 0%, 10%, and 15% (<i>w</i>/<i>w</i> soil), and PAM rates of 0%, 0.01%, and 0.02% (<i>w</i>/<i>w</i> soil) along with each FA rate. A simulated rainfall laboratory experiment (slope gradient of 10°, rainfall intensity of 1.5 mm/min) was conducted. During the rainfall, the cumulative runoff yield increased while the average infiltration rate decreased with increasing FA and PAM rates. A higher FA rate of 15% and varying PAM rates resulted in a prominent increase in cumulative sediment yield. After the rainfall, the two-dimensional distribution of water content retained in the soil profile reflected that both FA and PAM increased the water retention capacity of sandy soil, and the effect became more obvious at higher FA and PAM rates. The possible mechanism for the effect of FA and PAM on inhibiting water infiltration during the rainfall and retaining water in the soil layer after the rainfall is attributed to the filling of pores of the coarse soil particles by fine-sized FA particles and flocculation function and binding action of PAM. |
| first_indexed | 2024-12-14T11:13:31Z |
| format | Article |
| id | doaj.art-a4e2bf191c7c43a299a6d277879bc928 |
| institution | Directory Open Access Journal |
| issn | 2073-4395 |
| language | English |
| last_indexed | 2024-12-14T11:13:31Z |
| publishDate | 2020-03-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Agronomy |
| spelling | doaj.art-a4e2bf191c7c43a299a6d277879bc9282022-12-21T23:04:11ZengMDPI AGAgronomy2073-43952020-03-0110334410.3390/agronomy10030344agronomy10030344Effect of Co-Use of Fly Ash and Granular Polyacrylamide on Infiltration, Runoff, and Sediment Yield from Sandy Soil under Simulated RainfallKai Yang0Zejun Tang1Jianzhang Feng2Laboratory for Earth Surface Processes, College of Urban and Environmental Sciences, Peking University, Beijing 100871, ChinaCollege of Water Resources and Civil Engineering, China Agricultural University, Beijing 100083, ChinaCollege of Water Resources and Civil Engineering, China Agricultural University, Beijing 100083, ChinaCoal fly ash (FA) and polyacrylamide (PAM) are two common amendments for improving hydraulic properties of sandy soil. However, their interaction effect on infiltration-runoff processes in sandy soil has been scarcely reported. In this study, FA and anionic PAM granules were mixed thoroughly with a 0−0.2 m sandy soil layer at FA rates of 0%, 10%, and 15% (<i>w</i>/<i>w</i> soil), and PAM rates of 0%, 0.01%, and 0.02% (<i>w</i>/<i>w</i> soil) along with each FA rate. A simulated rainfall laboratory experiment (slope gradient of 10°, rainfall intensity of 1.5 mm/min) was conducted. During the rainfall, the cumulative runoff yield increased while the average infiltration rate decreased with increasing FA and PAM rates. A higher FA rate of 15% and varying PAM rates resulted in a prominent increase in cumulative sediment yield. After the rainfall, the two-dimensional distribution of water content retained in the soil profile reflected that both FA and PAM increased the water retention capacity of sandy soil, and the effect became more obvious at higher FA and PAM rates. The possible mechanism for the effect of FA and PAM on inhibiting water infiltration during the rainfall and retaining water in the soil layer after the rainfall is attributed to the filling of pores of the coarse soil particles by fine-sized FA particles and flocculation function and binding action of PAM.https://www.mdpi.com/2073-4395/10/3/344runoffsedimenterosioninfiltrationamendment |
| spellingShingle | Kai Yang Zejun Tang Jianzhang Feng Effect of Co-Use of Fly Ash and Granular Polyacrylamide on Infiltration, Runoff, and Sediment Yield from Sandy Soil under Simulated Rainfall Agronomy runoff sediment erosion infiltration amendment |
| title | Effect of Co-Use of Fly Ash and Granular Polyacrylamide on Infiltration, Runoff, and Sediment Yield from Sandy Soil under Simulated Rainfall |
| title_full | Effect of Co-Use of Fly Ash and Granular Polyacrylamide on Infiltration, Runoff, and Sediment Yield from Sandy Soil under Simulated Rainfall |
| title_fullStr | Effect of Co-Use of Fly Ash and Granular Polyacrylamide on Infiltration, Runoff, and Sediment Yield from Sandy Soil under Simulated Rainfall |
| title_full_unstemmed | Effect of Co-Use of Fly Ash and Granular Polyacrylamide on Infiltration, Runoff, and Sediment Yield from Sandy Soil under Simulated Rainfall |
| title_short | Effect of Co-Use of Fly Ash and Granular Polyacrylamide on Infiltration, Runoff, and Sediment Yield from Sandy Soil under Simulated Rainfall |
| title_sort | effect of co use of fly ash and granular polyacrylamide on infiltration runoff and sediment yield from sandy soil under simulated rainfall |
| topic | runoff sediment erosion infiltration amendment |
| url | https://www.mdpi.com/2073-4395/10/3/344 |
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