The present work is aimed at assessing the aftermath effects of the 2014 flood tragedy on the distribution, pollution status and ecological risks of the heavy metals deposited in the surface river sediment. A series of environmental pollution indexes, specifically the enrichment factor (EF), geo-accumulation index (I_geo), contamination factor (CF), modified degree of contamination (mC_d), pollution load index (PLI), potential ecological risk index (PERI) and sediment quality guidelines (SQGs) have been adopted. Results revealed that the freshly deposited sediments collected soon after the flood event were dominated by Cu, Fe, Pb, Ni, Zn, Cr and Cd, with the average concentrations of 38.74, 16,892, 17.71, 4.65, 29.22, 42.36 and 0.29 mg/kg, respectively. According to the heavy metal pollution indexes, Pahang River sediments were moderately to severely contaminated with Pb, Ni, Cu, Zn and Cr, while Cd with the highest risk of 91.09 was the predominant element that illustrated an aesthetic ecological risk to the water body after the tragic flood event. The findings highlighted a critical deterioration of the heavy metals content, driven by the catastrophic flood event, which has drastically altered their geochemical cycles, sedimentary pollution status and biochemical balance of the river's environment.

本工作旨在评估2014年洪灾悲剧对表层河底沉积物中重金属的分布，污染状况和生态风险的影响。一系列环境污染指数，特别是富集因子（EF），地质累积指数（I _geo），污染因子（CF），污染修正度（mC _d），污染负荷指数（PLI），潜在生态风险指数（PERI）和沉积物质量指南（SQG）已被采用。结果表明，洪灾后不久收集的新鲜沉积沉积物以Cu，Fe，Pb，Ni，Zn，Cr和Cd为主，平均浓度为38.74、16892、17.71、4.65、29.22、42.36和0.29 mg /公斤。根据重金属污染指数，彭亨河沉积物被中度至重度铅，镍，铜，锌和铬污染，而镉的最高危险度为91.09，这说明水污染后对水体的审美生态风险。悲惨的洪水事件。这些发现突出表明，在灾难性洪水事件的推动下，重金属含量严重恶化，这大大改变了它们的地球化学循环，沉积物污染状况以及河流环境的生物化学平衡。