Agricultural drought assessment based on the coupled hydrology-crop growth model and CWÀPI

被引：0
|
作者：
Zhang Y. [1 ,2 ]
Wu Z. [2 ]
He H. [2 ]
机构：
[1] School of Civil Engineering, Hefei University of Technology, Hefei
[2] College of Hydrology and Water Resources, Hohai University, Nanjing
来源：
Shuili Xuebao/Journal of Hydraulic Engineering | 2022年 / 53卷 / 10期
关键词：
agricultural drought assessment; Crop Water Anomaly Percentage Index (CWAPI); crop water requirements and consumption; Soil Moisture Anomaly Percentage Index (SMAPI); the coupled hydrology - crop growth model;
D O I：
10.13243/j.cnki.slxb.20220114
中图分类号：
学科分类号：
摘要：
The temporal and spatial development of agricultural drought is revealed using the drought index based on the simulated soil water content, which was widely applied to agricultural drought assessment on a large scale. Currently, when simulating soil water content for drought assessment, hydrological models are often used. However, hydrological models often oversimplify the crop module or even lack the crop simulation scheme, cannot simulate the crop water demand, and the soil drought index only based on the soil water content cannot accurately assess the actual agricultural drought due to the neglected crop water demand. In this study, the coupled hydrology-crop growth model, namely Variable Infiltration Capacity-Environmental Policy Integrated Climate (VIC-EPIC), was built considering irrigation influences, the Crop Water Anomaly Percentage Index (CWAPI) based on the variation process of crop water demand and consumption from the simulation of VIC-EPIC was proposed, and !he method of regional agricultural drought assessment was studied in the Qingkou river basin of China. The built CWAPI showed the state and cumulated impact of crop water stress on the crop growth based on the verification results due to the consideration of the influence of crop water demand; because the influences of the crop planting ratio, crop rotation types, and irrigation were considered, CWAPI revealed the regional crop drought degree more objectively than Soil Moisture Anomaly Percentage Index (SMAPI). The results showed that the effect of the crop planting ratio, crop rotation types, and irrigation needed to be considered when assessing the agricultural drought. © 2022 China Water Power Press. All rights reserved.
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页码：1168 / 1179and1193
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