The Drought Monitoring in Hexi Area Using the Runoff-denoted <i>Z</i> Index and the Palmer Index

Wang Jinsong; Huang Yuxia; Feng Jianying; Wang Baojian

Vol.20, NO.4, 2009

Article Contents

Article Navigation > Journal of Applied Meteorological Science > 2009 > 20(4): 471-477

Wang Jinsong, Huang Yuxia, Feng Jianying, et al. The drought monitoring in Hexi area using the runoff-denoted z index and the Palmer index. J Appl Meteor Sci, 2009, 20(4): 471-477.

Citation:

Wang Jinsong, Huang Yuxia, Feng Jianying, et al. The drought monitoring in Hexi area using the runoff-denoted z index and the Palmer index. J Appl Meteor Sci, 2009, 20(4): 471-477.

Wang Jinsong, Huang Yuxia, Feng Jianying, et al. The drought monitoring in Hexi area using the runoff-denoted z index and the Palmer index. J Appl Meteor Sci, 2009, 20(4): 471-477.

Citation:

Wang Jinsong, Huang Yuxia, Feng Jianying, et al. The drought monitoring in Hexi area using the runoff-denoted z index and the Palmer index. J Appl Meteor Sci, 2009, 20(4): 471-477.

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The Drought Monitoring in Hexi Area Using the Runoff-denoted Z Index and the Palmer Index

1.
Institute of Arid Meteorology of CMA, Key Laboratory of Arid Climatic Change and Reducing Disaster of Gansu Province, Lanzhou 730020
2.
Lanzhou Central Meteorological Observatory, Lanzhou 730020

Received Date: 2008-06-11
Rev Recd Date: 2009-05-26
Publish Date: 2009-08-31

Abstract

Abstract

Hexi is a typical irrigation agricultural area, it is impossible to grow crops based on the natural precipitation, which is only 100-150 mm every year on average. The runoff of inland river is the main water resource for agriculture. That means the high/low runoff is the main determination of dry/wet condition in the target area. Therefore, runoff is considered as the variable to define a Z-index in order to monitor the drought in Hexi irrigation area. Being the Palmer drought severity index-PDSI has been widely applied in the world since the 1960s. In addition, the PDSI is also widely used in drought assessment, comparison and its spatial/temporal distributions analysis. So PDSI is selected to compare with the runoff-denoted Z index in the drought monitoring in Hexi area.The monthly runoff data from hydrological representative station, the tilth area and the meteorological data from representative station of inland river in Hexi area are utilized. A runoff-denoted drought index, the runoff-denoted Z index is established by processing runoff normally. Dry and wet grades are also divided using this index. Considering the relationship between the dry/wet grades and the actual situation of agricultural irrigation, the irrigation grades of Z index are obtained. The precipitation is derived from runoff to revise the Palmer drought severity index. In addition, Penman method is adopted replacing the Thornthwaite method to improve the potential evaporation calculating scheme. Results show that drought monitoring is improved when the runoff is calculated in Palmer drought severity index and the calculation method of potential evaporation is changed. Based on the drought events in Hexi area, the monitoring effect of the Z index is better than the Palmer drought severity index. So it can be concluded that the drought monitored by the runoff-denoted Z index is closer to the actual status in Hexi irrigation area.
- Hexi irrigation area;
- runoff of inland river;
- runoff-denoted Z index;
- Palmer drought severity index

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References(20)

Figures and Tables

图 1 1959-2004年3条内陆河流域径流量Z指数灌溉等级演变 (a) 疏勒河, (b) 黑河, (c) 石羊河

Fig. 1 The evolution of runoff-denoted Z index irrigation grades of three inland rivers during 1959-2004(a) Shule River, (b) Hei River, (c) Shiyang River

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图 2 不同方案下PDSI、径流量Z指数干旱监测结果比较

Fig. 2 The comparison of drought monitor correctness between PDSI with different schemes and runoff-denoted Z index

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表 1 径流量Z指数旱涝等级标准

Table 1 Runoff-denoted Z index dry/wet grades

表 2 3种方案计算得到的PDSI、径流量Z指数所指示的干旱等级及其与实际旱情的对比

Table 2 The dry grades calculated by the PDSI with three schemes and runoff-denoted Z index and their comparison to actual drought situation

表 3 3种方案计算得到的PDSI以及径流量Z指数漏监测的干旱年份

Table 3 The excluding drought years by using the PDSI with three schemes and runoff-denoted Z index to monitor

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