Effects of polyacrylamide and gypsum on soil erosion and sediment transport
作者： H. Mahardhika , Bofu Yu , Hossein Ghadiri
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摘要: This study evaluates the effectiveness of two popular soil amendments gypsum and polyacrylamide (PAM), in minimizing erosion from one overburden (spoil) material a mine rehabilitation site North Queensland. The treatments included; untreated (control), application rate 10 t/ha, anionic PAM 40 kg/ha, combined both (PAM+gypsum) at same rates above, all replicated three times. Rainfall experiments were carried out Griffith University's rainfall-runoff simulation facility on 9% slope mean rainfall intensity 120 mm/h duration 30 minutes. Runoff sediment samples collected specific time intervals during experiments. Total loss treated spoil significantly lower than for control. reduced by 39%, 58%, 80%, respectively gypsum, PAM, PAM+gypsum treatments, compared to was 48%, 60%, 72%, Results indicate that use combination reduce tested but gives best results both. improved surface conditions contributed towards reduction loss. effective maintaining well-aggregated minimize detachment rain runoff resistant sealing. slopes prior establishment vegetation may be an way reducing offsite consequences pollutant transport viable cover. These appear increase moisture thus helping cover as well.
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