
1. 三峡库区生态环境教育部工程研究中心
2. 三峡大学水利与环境学院
3. 广东省源天工程有限公司
Published:2026
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杨紫剑, 刘佳, 肖尚斌, et al. 三峡水库典型支流水化学变化特征及成因分析[J]. 2026, 48(1): 32-40.
杨紫剑, 刘佳, 肖尚斌, et al. 三峡水库典型支流水化学变化特征及成因分析[J]. 2026, 48(1): 32-40. DOI: 10.13393/j.cnki.issn.1672-948X.2026.01.005.
为探究三峡库区支流库湾水体水化学变化特征及干流回水对支流库湾水化学的影响,2022年4月对三峡水库小江、大宁河、香溪河三条典型支流库湾进行了采样及分析.结果表明,三条支流库湾优势阴、阳离子分别为HCO
3
-
、Ca
2+
其中HCO
3
-
质量浓度均值分别为155.50、152.20和171.50 mg·L
-1
占总阴离子质量浓度的67%、93%和95%;Ca
2+
质量浓度均值分别为34.70、49.40和47.00 mg·L
-1
占总阳离子质量浓度的58%、61%和60%.小江、香溪河库湾水化学类型为HCO
3
-
-Ca
2+
大宁河库湾水化学类型为HCO
3
-
·SO
4
2-
-Ca
2+
.Gibbs图与端元图的结果显示,岩石风化主导的碳酸盐岩溶解是控制水化学的主要机制,但大宁河流域蒸发盐岩强度较高且大于小江与香溪河,加之大宁河有小三峡景区,存在较大的人类活动干扰,导致其Cl
-
质量浓度(26.60 mg·L
-1
)是小江(2.90 mg·L
-1
)和香溪河(2.00 mg·L
-1
)库湾的9~12倍.采用保守离子(如Cl
-
和Na
+
)示踪法估算贡献率,小江、大宁河、香溪河三条支流库湾回水区的干流来水贡献率分别约为49.0%、70.5%、71.9%
干流回水对三条支流库湾的影响与距离三峡大坝远近以及支流流量有关,而支流库湾的补给与稀释程度取决于干支流来水的物质差异与水团大小.
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