Analysis of a new round of groundwater resource evaluation in Yunnan Province
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摘要: 在系统研究云南省水文地质条件的基础上,将云南省地下水系统划分为21个四级流域系统,41个五级评价单元。文章论述了地下水资源的评价方法、参数确定,并展示了最终评价成果。2000-2020年多年平均地下水资源补给量为854.66亿m3·a−1,多年平均地下水径流资源量629.16亿m3·a−1,多年平均地下水径流资源量占地下水资源补给量的73.62%。对223个水质监测点检测结果评价分析显示:无Ⅰ类水;Ⅱ类水9个,占4%;Ⅲ类水24个,占10.76%;Ⅳ类水112个,占50.22%;Ⅴ类水78个,占34.98%。受污染的地下水类型多为孔隙水,一般属轻度或中等污染,少部分地区属重污染;基岩裂隙水,污染程度轻微。主要污染区分布于经济发达、人口密集的城市,如昆明、曲靖、玉溪、开远、楚雄、大理等地。Abstract:
Yunnan Province is located in the eastern region of the Qinghai-Tibet Plateau and the western area of the Yunnan-Guizhou Plateau. This province is characterized by mountainous plateau topography and is abundant in water resources. Groundwater resources hold great potential for development and utilization, but there is a critical issue regarding their uneven spatial distribution. Therefore, it is imperative to accurately investigate and evaluate the groundwater resources in Yunnan Province. Based on the systematic study of hydrogeological conditions in this province, its groundwater system is divided into 21 four-level basin systems and 41 five-level units for groundwater resource evaluation. In this paper, we systematically discuss the evaluation method and parameter determination for groundwater resources, and summarize and present the final evaluation results. In this evaluation, we utilized long-term rainfall data spanning from 2000 to 2020, along with the permeability coefficient and runoff modulus obtained from 1∶50,000 hydrogeological surveys conducted in Zhaotong, Yuanmou, Binchuan, Qujing, Yuxi, and other basins since 1960. Additionally, we incorporated data from the 1∶50,000 hydrogeological surveys of key karst areas in Yunnan, as well as the 1∶50,000 hydrogeological survey report of this province. We used the monitoring data from meteorological and hydrological stations to adjust the parameters of each evaluation zone in order to assess the groundwater resources in Yunnan Province. It is concluded that the average annual recharge of groundwater resources from 2000 to 2020 was 85.466 billion m3·a−1. The average annual groundwater runoff resources was 62.916 billion m3·a−1, accounting for 73.62% of the groundwater resource supply. Among them, the average annual groundwater resource supply in the Yangtze River Basin from 2000 to 2020 was 18.131 billion m3·a−1, while the average annual groundwater runoff resources during the same period was 13.942 billion m3·a−1. In contrast, the average annual groundwater resource supply in the river basins of Southwest China from 2000 to 2020 was 48.258 billion m3·a−1, with average annual groundwater runoff resources amounting to 34.106 billion m3·a−1. Besides, the average annual recharge of groundwater resources in the Pearl River Basin from 2000 to 2020 was 190.77 billion m3·a−1, and the average annual groundwater runoff resources was 148.68 billion m3·a−1. In the past 21 years, the groundwater resource supply in the Yangtze River Basin, the river basins of Southwest China, and the Pearl River Basin exhibited significant fluctuations, with the lowest supply occurring in 2011. The highest groundwater resource supply in the Yangtze River Basin was recorded in 2016. The Pearl River Basin experienced its peak supply in 2015, and the river basins of Southwest China had the highest supply in 2008. The data presented not only highlights the disparities in groundwater resources across various basins in Yunnan Province, but also serves as a crucial foundation for regional water resource management and planning. In terms of groundwater quality, the results from 223 water quality monitoring points in 2021 indicate that there were no Class I water samples detected; Class II water was found at 9 points, accounting for 4% of the total; Class III water was detected at 24 points, accounting for 10.76%; Class IV water was identified at 112 points, making up 50.22%; and Class V water was present at 78 points, which accounted for 34.98%. The types of contaminated groundwater primarily included pore water, which typically exhibited mild to moderate levels of pollution. In contrast, only a few areas were heavily polluted. Additionally, bedrock fissure water was present, but its degree of pollution was generally slight. Most of the pollutants were NH4+, F−, Fe, Mn, volatile phenols, Hg, COD, etc. The analysis of the factors influencing the quality of Class IV and Class V groundwater indicated that the most significant contributor to water quality exceeding permitted levels was the visible matter, followed by volatile phenols and manganese. In addition to the sensory index, the most influential factor was volatile phenols, followed by manganese and ammonia nitrogen. The main areas of pollution were concentrated in economically developed and densely populated cities, such as Kunming, Qujing, Yuxi, Kaiyuan, Chuxiong, Dali, and other places. In summary, although the groundwater resources in Yunnan Province are abundant, the water quality problem cannot be ignored. In the future, the protection and management of groundwater resources should be strengthened, especially in the areas with rapid economic development. The sustainable utilization of groundwater resources should be ensured by implementing stricter environmental protection policies, strengthening the monitoring and control of pollution sources, promoting water-saving technologies, and raising public awareness of environmental protection. -
Key words:
- groundwater resources /
- evaluation method /
- calculation parameter /
- hydroecology /
- the Yunnan plateau
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表 1 评价参数取值表
Table 1. Values of evaluation parameters
含水
类型地层
代号富水性划分指标 地下水径
流模数
/L∙s−1·km−2地下水径流
模数平均值
/L∙s−1·km−2泉/L∙s−1 地下河出口/L∙s−1 流 量 平均流量 流 量 平均流量 裸露型
岩溶水含
水岩组较纯灰岩裂
隙溶洞水P2q-m 0.01~864.86 3.42 40.53~ 6500.00 945.09 4.3~22.15 11.78 Є1q 0.10~2.20 0.87 135.00 135.00 6.67~8.50 7.12 不纯灰岩溶
洞裂隙水S1sh 0.01~2.97 0.56 2.36~5.21 4.32 T2g2 0.10~60.98 2.65 14.21~ 5490.00 1455.00 4.58~5.36 4.98 T1-2j 0.05~201.00 4.87 6.73~210.00 62.95 3.00~19.06 8.87 O3j-w 0.02~50.49 0.45 1.26~4.62 3.43 O2-3sh-b 0.01~30.52 0.09 0.14~0.82 0.54 T2g1 0.01~68.35 1.23 2.03~2.56 2.27 T1y2 0.01~150.56 2.11 28.00~240.90 100.30 3.07~3.45 白云岩孔
洞裂隙水O1t-h 0.20~30.20 1.16 5.26 Є2-3l 0.01~68.61 1.97 510.20 510.20 3.88~5.30 4.85 Є2g-s 0.01~8.87 1.15 3.40~4.33 非可溶岩孔
隙裂隙水
含水岩组碎屑岩岩
孔裂隙水J3s 0.01~0.25 0.11 0.52~0.92 J2s 0.01~0.51 0.13 1.32~1.43 J2x 0.05~0.31 0.17 0.83~0.94 J1z 0.005~0.44 0.09 0.85~0.96 J1x 0.52~0.92 T3s 0.10 0.10 0.83 P3lt-c 0.01~3.40 0.48 3.07~3.86 P2ls 0.10~1.83 0.42 2.12~2.85 S1h 0.80 0.80 0.92 S1l 0.513 0.513 0.86 O1-2m 0.01~10.07 0.85 3.03~3.68 Є1j 0.31 0.31 0.90 玄武岩(风化)裂隙水 P3β 0.01~15.60 0.33 0.32 表 2 云南省水资源评价结果对比表
Table 2. Comparison of water resource evaluation results in Yunnan Province
评价时间 地下水补给量/
亿m3∙a−1地下水资源量/亿m3∙a−1 径流模数法 水文分割法 2000-2020年(多年平均) 752.440 742.740 761.610 2000-2020年(多年平均) 线下计算 854.655 629.158 栅格分析 872.737 632.102 表 3 2021年度地下水质量评价统计表
Table 3. Statistics of comprehensive evaluation of groundwater quality in 2021
地下水资源分区 含水介质类型 统计监测
点数/个最高单项指标类别 Ⅰ Ⅱ Ⅲ Ⅳ Ⅴ 金沙江 岩溶水 74 7 15 35 17 孔隙水 31 1 14 16 裂隙水 26 1 15 10 澜沧江—红河 岩溶水 1 1 孔隙水 18 2 2 9 5 裂隙水 19 9 10 怒江—伊洛瓦底江 岩溶水 4 3 1 孔隙水 13 2 5 6 裂隙水 4 2 2 珠江中上游 岩溶水 12 1 5 6 孔隙水 10 1 7 2 裂隙水 11 8 3 合计 223 9 24 112 78 表 4 珠江流域水资源计算验证表
Table 4. Verification of water resource calculation in the Pearl River Basin
项目 水资源量/万m3∙a−1 对A比值 对B比值 对C比值 对D比值 A.珠江流域地下水资源量(基流分割法) 1870704634 1 329.55% 893.02% 346.46% B.南盘江2020~2021基流量下限 567648000 30.34% 1 270.98% 105.13% C.南盘江枯季径流量 209480324 11.20% 36.90% 1 38.80% D.径流量法珠江枯季资源量 539949400 28.86% 95.12% 257.76% 1 -
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