Study on the Salinization Mechanism of Shallow Groundwater along the Upstream Qingshui River in Ningxia

Abstract

Abstract:

Research on salinization mechanism of groundwater in arid areas is of great significance for water resources management. Fifty-two groundwater samples and eight rock samples were taken from the upstream Qingshui river plain in Ningxia. Hydrogeochemical processes controlling groundwater salinization were studied and their contribution ratios to salinity were calculated using element mass balance method. The results show that the salinization extent increased along groundwater flow path. The salinization processes mainly depended on rock weathering and had a spatial variation. Carbonate weathering played a dominant role in recharge area and sulfate weathering in strong runoff area. In slow runoff area, 68-93 percents of total salt were supplied by sulfate and halite weathering. The contribution ratios of evaporite increased with groundwater TDS, while carbonate and silicate had an opposite trend, which indicated that evaporite weathering controlled groundwater salinization.

Key words: groundwater salinization, rock weathering, evaporite, mass balance, Qingshui river in Ningxia

CLC Number:

P641

WANG Yushan, LI Shu, MENG Ying, CHENG Xuxue. Study on the Salinization Mechanism of Shallow Groundwater along the Upstream Qingshui River in Ningxia[J]. Geoscience, 2017, 31(01): 191-199.

Figures/Tables 10

References 22

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水文地质单元 (样品数)		pH	TDS	Ca²⁺	Mg²⁺	Na⁺	K⁺	HCO₃^-	Cl^-	SO₄^2-	NO₃^-	Si
Ⅰ(12)	最小值	7.80	385.10	52.90	31.80	21.60	2.30	268.50	14.20	32.70	0.88	1.35
	最大值	8.79	710.90	92.50	95.80	80.10	4.30	388.10	31.90	236.30	35.35	8.78
	均值	8.22	571.08	74.58	51.72	45.63	2.78	351.84	20.87	158.08	13.84	6.96
	中位值	8.16	563.85	74.10	47.15	42.50	2.55	367.90	20.60	145.05	13.14	7.85
Ⅱ(16)	最小值	7.72	981.30	28.10	46.20	131.20	2.10	269.70	28.40	212.30	0.00	5.26
	最大值	8.50	3 615.00	193.20	204.90	812.40	14.20	683.40	546.70	1 630.00	69.04	8.71
	均值	8.19	1 618.98	83.63	103.01	321.94	4.63	407.67	195.26	657.81	27.71	6.90
	中位值	8.20	1 388.00	73.15	79.25	265.04	4.30	376.45	156.35	567. 03	18.92	7.29
Ⅲ(19)	最小值	7.80	1 083.60	57.30	74.90	98.20	2.90	236.70	26.20	574.50	3.53	5.22
	最大值	8.65	4 865.30	275.60	255.20	1 199.60	12.90	408.80	1145.30	2 416.20	78.51	8.99
	均值	8.21	2 819.58	150.96	143.87	591.37	5.52	322.93	448.82	1 257.54	33.42	6.85
	中位值	8.20	2 258.32	124.20	141.06	594.00	4.90	308.70	322.60	1 141.00	32.57	6.75

水文地质单元 (样品数)		pH	TDS	Ca²⁺	Mg²⁺	Na⁺	K⁺	HCO₃^-	Cl^-	SO₄^2-	NO₃^-	Si
Ⅰ(12)	最小值	7.80	385.10	52.90	31.80	21.60	2.30	268.50	14.20	32.70	0.88	1.35
	最大值	8.79	710.90	92.50	95.80	80.10	4.30	388.10	31.90	236.30	35.35	8.78
	均值	8.22	571.08	74.58	51.72	45.63	2.78	351.84	20.87	158.08	13.84	6.96
	中位值	8.16	563.85	74.10	47.15	42.50	2.55	367.90	20.60	145.05	13.14	7.85
Ⅱ(16)	最小值	7.72	981.30	28.10	46.20	131.20	2.10	269.70	28.40	212.30	0.00	5.26
	最大值	8.50	3 615.00	193.20	204.90	812.40	14.20	683.40	546.70	1 630.00	69.04	8.71
	均值	8.19	1 618.98	83.63	103.01	321.94	4.63	407.67	195.26	657.81	27.71	6.90
	中位值	8.20	1 388.00	73.15	79.25	265.04	4.30	376.45	156.35	567. 03	18.92	7.29
Ⅲ(19)	最小值	7.80	1 083.60	57.30	74.90	98.20	2.90	236.70	26.20	574.50	3.53	5.22
	最大值	8.65	4 865.30	275.60	255.20	1 199.60	12.90	408.80	1145.30	2 416.20	78.51	8.99
	均值	8.21	2 819.58	150.96	143.87	591.37	5.52	322.93	448.82	1 257.54	33.42	6.85
	中位值	8.20	2 258.32	124.20	141.06	594.00	4.90	308.70	322.60	1 141.00	32.57	6.75