Hydrogeological environmental geological survey and evaluation in southwest karst area is one of the basic hydrogeological environmental geological surveys deployed by China Geological Survey, led by Institute of Karst Geology of Chinese Academy of Geological Sciences, and attended by Yunnan Geological Survey, Guizhou Geological Survey Institute, Guangxi Zhuang Autonomous Region Regional Geological Survey Institute, Hunan Geological Survey Institute, Hubei Geological Environment Station, Chongqing Geological Survey Institute, Sichuan Geological Survey Institute, Guangdong Geological Survey Institute and Aviation Geophysical Remote Sensing Center of Ministry of Land and Resources. The work area covers karst areas in Yunnan, Guizhou, Guangxi, Hunan, Hubei, Sichuan, Chongqing and Guangdong, with a total area of 780,000 square kilometers. 1999 to 20 10,1∶ 50,000 hydrogeological survey area of 200,000 km2, hydrogeological drilling of 52,000 m, comprehensive geophysical exploration of 60,000 points and karst cave exploration of 60km.

Main achievements: 80 investigation and evaluation reports and 300 maps were submitted, and the hydrogeology and environmental geology database of southwest karst area was initially established. Published 9 monographs and papers 1 10. Taking the karst basin as a unit, a comprehensive survey of hydrogeology and environmental geology of1∶ 50,000 was carried out, and the karst drought, flood and rocky desertification were mastered, and the karst water development project scheme and comprehensive geological environment improvement zoning were put forward. Select typical karst water sources for groundwater development and demonstration of comprehensive management of ecological environment; Comprehensive research on groundwater and environmental geology in southwest karst areas will provide basic geological data and countermeasures for solving drought and water shortage in southern karst areas and promoting comprehensive management of rocky desertification, and provide geological scientific basis and technical support for new rural construction in southern karst areas. According to the development conditions of different types of areas, according to local conditions, the development and utilization of karst groundwater and the demonstration of comprehensive management of ecological environment were carried out by plugging holes and storing water, intercepting underground rivers, returning water from large springs, drilling wells, drilling large wells and drilling inclined wells.

Technical features: the accuracy of regional hydrogeology and environmental geology survey is1:50,000, and the accuracy of hydrogeology and engineering geology demonstration in the demonstration project area of groundwater development and utilization is1:/kloc-0,000 to1:2000. Take the surface water and groundwater system as a whole, implement the demonstration project of comprehensive improvement of ecological environment, and establish the optimization model of effective development, utilization and protection of water resources through agricultural structure adjustment, soil erosion prevention, rocky desertification control and ecological restoration.

Second, the scope of application and application examples

1. Scope of application

The results of the project can be widely used in the economic and social development of karst areas in southwest China, especially to provide basic geological basis for solving typical resource and environmental problems such as drought and water shortage, soil erosion and karst rocky desertification, deterioration of groundwater quality, karst collapse and karst waterlogging.

2. Popularization, application and effect.

The results of the project played an important supporting role in the drought-resistant water-seeking and well-drilling operation organized and implemented by the Ministry of Land and Resources on 20 10, with 2,348 wells drilled, which solved the drinking water problem of 5.2 million people.

During the implementation of the project, six underground regulating reservoirs were formed by intercepting underground rivers, and more than 200 wells were drilled, which solved the drinking water problem of more than 6,543,800 people and the irrigation water problem of more than 500,000 mu of cultivated land. Xie cun Qiao Mei Demonstration Zone, Litang Town, Guangxi, developed the groundwater of surface karst system and built an efficient agricultural base with vegetables as the main part, which made the total output value of vegetables reach130,000 yuan, an increase of 20% ~ 30%. The output of radish has increased from 2,000 kilograms in the past to 3,500-3,500-5,000 kilograms now, with an annual output value of 2.35 million yuan, an increase of 6,543,800 yuan+0.25 million yuan, and per capita income. In Sanzhiyang Demonstration Zone in Du 'an County, Guangxi Province, seven reservoirs were built in the valley where the surface karst spring and slope flow meet, and drip irrigation technology was used to meet the water demand of fruit trees and medicinal materials bases, and four types of ecological comprehensive construction zones were built. The per capita annual income of local residents has increased by more than 800 yuan over the past. A demonstration project of fruit surface karst water development and ecological restoration was carried out in Pingguo County, Guangxi, and the spring water in high surface karst zone was used for key development and demonstration. Six water tanks with a capacity of 3000m3 were built, and a tap water project was built near the village, ending the history that 278 households in Longhe and Miaoguan natural villages were short of water for generations. Install an irrigation system integrating sprinkler irrigation, drip irrigation and irrigation to ensure high and stable yield of crops. Establish a three-dimensional eco-agricultural model in peak-cluster karst areas and a demonstration base for intensive management of early fruiting and high-yield cultivation of famous fruit trees in rocky desertification areas. On the edge of Luxi Basin in Yunnan Province, a demonstration project of backwater development by adjusting the beam pressure of Pijiazhai karst spring was built, with an allowable exploitation amount of 60,000 m3/d, which solved the drinking water problem of 25,660 people and the irrigation water problem of 36,000 mu of cultivated land. In Guizhou province, the demonstration project of karst water development in Jumu underground river was implemented, and underground space was used to intercept groundwater at the exit of underground river to form a reservoir. The underground reservoir 1 seat, with a storage capacity of 2.392 million m3, and the high-level reservoir 1 seat, with a storage capacity of 300m3, has solved the drinking water problem of more than/kloc-0.2 million people and/kloc-0.4 million large livestock in this area. The average income of rice increased by 1.50 kg/mu, the total income of rice increased by 900,000 kg/year, the output of rape increased by 88,200 kg/year, and the economic income was realized by 1.45 million yuan/year. By looking for favorable water-rich zones in Bijie, Guizhou, hydrogeological drilling was carried out, and 14 wells were completed, with water inflow of 45,000.

Third, promote the transformation mode.

It mainly includes: publicity and reporting, conference exchange, information service, technical consultation, on-site service, technology transfer and so on.

Name of technical support unit: Institute of Karst Geology, Chinese Academy of Geological Sciences

Contact: Wang Shen

Mailing address: No.50 Qixing Road, Guilin, Guangxi.

Postal code: 54 1004

Tel:13517731392.

E-mail: tingw567 @ 126.com