img

Wechat

Adv search

Journal of Desert Research ›› 2020, Vol. 40 ›› Issue (4): 24-33.DOI: 10.7522/j.issn.1000-694X.2020.00010

Previous Articles     Next Articles

Characteristics of hydrological drought based on standardized flow index in Shiyang River Basin of China

Lingping Li1,2(), Taishan Lu3(), Mingchun Liu2, Lili Hu1, Suping Wang1   

  1. 1.Key Laboratory of Arid Climatic Change and Reducing Disaster, Institute of Arid Meteorology, China Meteorological Administration, Lanzhou 730020, China
    2.Wuwei Meteorological Bureau, Wuwei 733000, Gansu, China
    3.Jinta River Water Resources Management Office, Water Bureau of Liangzhou District of Wuwei, Wuwei 733000, Gansu, China
  • Received:2019-10-23 Revised:2020-01-05 Online:2020-08-20 Published:2020-09-01
  • Contact: Taishan Lu

Abstract:

Based on the monthly flow data of eight hydrological stations and meteorological data of four meteorological stations in Shiyang River Basin from 1961 to 2017, this paper uses the standardized flow index and run theory to obtain the characteristic indexes of drought events, and analyze the evolution of hydrological drought duration, drought severity, drought intensity, drought time series and drought frequency in Shiyang River Basin. Furthermore, affecting factors of precipitation, temperature, and evaporation indices were also analyzed. The results show that: In the past 57 years, the changes of drought duration, drought severity and drought intensity are not consistent in Shiyang River Basin. The hydrological drought duration is the longest in 1970s and the shortest in 1980s in Shiyang River Basin, and the drought severity is the strongest in 1990s and the weakest in 1980s, and the drought intensity is the strongest in 1960s and the weakest in 1980s.The annual SDI shows an increasing trend in Shiyang River Basin and its middle and western regions, with the greatest increase in the western region and a small increase in the central region, while the annual SDI shows a decreasing trend in the eastern part of the basin. The frequency of the most are moderate and severe drought in Shiyang River, and the frequency of seasonal hydrological drought is the highest in spring and the frequency of winter drought is the lowest. The frequency of hydrological drought is the highest in the eastern of the basin. The majority of hydrological drought events and grades over the past 57 years in Shiyang River Basin can be identified well on the basis of SDI. The threshold of SDI is more sensitive to reflect great hydrological drought events and grades, and the result from SDI is more reasonable. There is a negative correlation between SDI and annual evaporation, maximum temperature, minimum temperature in Shiyang River Basin, while is a positive correlation between SDI and annual precipitation, mean temperature.

Key words: Shiyang River Basin, standardized flow index, threshold, hydrological drought

CLC Number: