| 降雨径流汇入背景下受纳水体可溶态Ni和As的动态变化 |
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| 引用本文： | 刘浩峰,刘玉燕,张一玮,丁方方,张牛牛,王林.降雨径流汇入背景下受纳水体可溶态Ni和As的动态变化[J].热带地理,2022,42(12):2088-2097. |
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| 作者姓名： | 刘浩峰 刘玉燕 张一玮 丁方方 张牛牛 王林 |
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| 作者单位： | 1.海南师范大学 地理与环境科学学院，海口 570100;2.海南省热带海岛地表过程与环境变化重点实验室，海口 570100 |
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| 基金项目： | 国家自然科学基金(42261018) |
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| 摘 要： | 选取降雨丰沛、降雨径流突出的热带海岛城市海口美舍河市区河段，使用室内分析与野外采样结合的方法开展降雨径流汇入后受纳水体可溶态Ni和As的动态变化研究。结果表明：降雨径流的汇入直接对受纳水体中Ni和As的固液分配产生干扰，且其对受纳水体Ni和As的输入贡献主要依赖悬浮态，可溶态Ni和As输入相对较弱。具体表现为：降雨径流汇入前受纳水体可溶态Ni和As占总质量浓度的比例分别达到55.67%和94.77%。降雨径流汇入后，受纳水体Ni和As发生一系列动态变化，排水口处可溶态Ni和As占比分别达总质量浓度的20.97%和76.92%，可溶态占比明显下降，变化较为剧烈；排水口下游可溶态Ni和As占比也均下降，分别为47.23%和88.38%。对不同降雨情境下的数据分析发现：当降雨量≤10 mm时，雨前干燥期长短是受纳水体可溶态Ni和As动态变化的主要影响因素；当降雨量在10~30 mm时，雨前干燥期长短、雨强峰值出现时间及其大小是受纳水体可溶态Ni和As对降雨径流响应时间及响应程度的主要影响因素；当降雨量≥30 mm时，雨强峰值出现时间是受纳水体可溶态Ni和As动态变化的主要影响因素。降雨径流对受纳水体可溶态Ni和As的影响存在差异，当干燥期短、且存在最大雨强值过高现象时，受纳水体可溶态As受降雨径流影响小，而可溶态Ni受降雨径流影响明显。
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| 关 键 词： | 降雨径流 受纳水体 可溶态 雨强 Ni As 美舍河 海口市 |
| 收稿时间： | 2021-10-23 |
Changes of Soluble Nickel and Arsenic in Receiving Water with Rainfall-Runoff Inflow |
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| Haofeng Liu,Yuyan Liu,Yiwei Zhang,Fangfang Ding,Niuniu Zhang,Lin Wang.Changes of Soluble Nickel and Arsenic in Receiving Water with Rainfall-Runoff Inflow[J].Tropical Geography,2022,42(12):2088-2097. |
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| Authors: | Haofeng Liu Yuyan Liu Yiwei Zhang Fangfang Ding Niuniu Zhang Lin Wang |
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| Institution: | 1.School of Geography and Environmental Science, Hainan Normal University, Haikou 570100, China;2.Key Laboratory of Earth Surface Processes and Environmental Change of Tropical Islands, Hainan Province, Haikou 570100, China |
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| Abstract: | Rainfall-runoff is the main source of pollution in the urban water environment. This study investigated the dynamic changes of soluble Nickel (Ni) and Arsenic (As) in the receiving water body after the rainfall and runoff of the Meishe River in Haikou. Field sampling and indoor analysis were used. Results revealed that the solid-liquid partitioning of Ni and As in the receiving water body is directly disturbed by the inflow of rainfall-runoff. The main source of the input is the suspended state, and the input of the dissolved state is smaller. The specific performance is as follows. Before the rainfall-runoff flows into the receiving water body, the ratio of soluble Ni and As to the total content reaches 55.67% and 94.77%, respectively. After the rainfall-runoff flows in, a series of dynamic changes of Ni and As occur in the receiving water body. The proportion of soluble Ni and As at the outlet decreases significantly and changes dramatically, reaching 20.97% and 76.92% of the total content, respectively. The proportion of soluble Ni and As in the downstream of the drainage outlet also decreases to a certain extent, reaching 47.23% and 88.38%, respectively. The data under different rainfall scenarios indicate that the long dry period, when the rainfall is less than 10 mm, is the main factor affecting the dynamic changes of soluble Ni and As. Furthermore, the long dry period, along with the peak time, and magnitude of the rain intensity are the major influencing factors of the response time and degree of soluble Ni and As to rainfall-runoff, when the rainfall amount ranges from 10-30 mm. The peak time of rainfall intensity is the main factor affecting the dynamic change of soluble Ni and As in the receiving waters when the rainfall amount is above 30 mm. The effects of rainfall-runoff on the soluble Ni and As in the receiving water are different. When the dry period is short and the maximum rainfall intensity is high, in receiving water, soluble As is less affected by rainfall-runoff, while soluble Ni is significantly affected. |
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| Keywords: | rainfall-runoff receiving water soluble state rainfall intensity Ni As Meishe River Haikou |
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