Based on the drought disaster data of the Heng-Shao drought corridor from 1961 to 2018, the meteorological drought composite index (MCI) was used to study the drought monitoring and evaluation methods of the Heng-Shao drought corridor. The results are as follows: (1) During the peak period of crop water demand (from June to October), the drought events with weighted mean of regional MCI (DI) less than or equal to -0.5 and the process duration greater than or equal to 16 days were included in the statistics, and the three elements such as the extreme intensity, cumulative intensity and duration of DI index were the best factors for annual regional drought assessment. Furthermore, based on the three elements of DI index, the annual assessment index of regional drought (MCIe) calculated by using the TOPSIS method was the best. (2) Based on the MCIe index, the combined grading method of average value and standard deviation was used to obtain the threshold of regional drought degree for normal, drought, severe drought, and extreme drought years. It was found that the MCIe index had a strong ability to assess extreme drought years and normal years in the Heng-Shao district, and had good assessment ability for 2019 and 2020. Furthermore, the extreme disaster year in 2013 was simulated, it was found that the MCIe index could better capture the change of drought in the Heng-Shao drought corridor. Therefore, the MCIe index could support the rapid assessment and early warning of drought in the Heng-Shao drought corridor to some extent.
Water resource is very lack in Qingyang city which is located to resources very difficult to exploit,sustainable development.a saresult total thercs a great short the central region of Loess Plateau, and existing waof available water resource,and it prevents society economy from water resource and this paper, and some problems in utilization of water resource were its utilization status in Qingyang city were surveyed in analyzed combining the local economy and geographical characteristic, and the basic countermeasures of sustainable utilization in water resource were brought forward too.
According to the observational data of aerosols over Lanzhou city from June 2000 to May 2001, the concentration and size distribution of aerosols in the atmosphere including their yearly, monthly and daily variation were analyzed, and the influence of at-mosphere aerosols on human heath was discussed also. The results show that the variation tendencies of monthly mean density of PM10 and monthly mean number of persons infected with respiratory diseaseat the same period are basically coincident, they present nificant positive correlation. When aerosol concentration is on the high increase in 1-2 r avs.the number of persons infected respiratory disease will increase in 1~2 days.