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| DOI：10.13522/j.cnki.ggps.2022018 |
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| Comparison of Conceptual Hydrological Models for Lijiang River Basin |
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YANG Yang, ZHAI Luxin, JIA Yanhong, XUE Kaiyuan
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1. School of Environment and Resources, Guangxi Normal University, Guilin 541004, China; 2. Key Laboratory of Ecology of Rare and Endangered Species and Environmental Protection, Guilin 541004, China; 3. Guangxi Key Laboratory of Landscape Resources Conservation and Sustainable Utilization in Lijiang River Basin, Guilin 541004, China
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| Abstract: |
| 【Background and objective】Hydrological process is a complex phenomenon and affected by many biological and physical processes. Its modelling in water resource management and decision-making in watershed or catchment is often based on conceptual models where the complicated processes that directly or indirectly modulate water flow in different components are highly simplified. Such models are mathematically simple and have been widely used in both practical and scientific communities. Different conceptual hydrological models are available, but how they compare with each other for simulating hydrological processes in watersheds is not well studied. The purpose of this paper is to fill this gap.【Method】We compared 45 conceptual hydrological models for their application in the Lijiang River Basin. For each model, we simulated daily runoff in the basin from 2008 to 2016 using the same dataset, and compared and analyzed their performance in terms of model structure, calculated evapotranspiration and runoff, from which we identified main factors which affect model applicability and accuracy most.【Result】MODHYDROLOG was the model that worked best for simulating hydrological flow in the basin, followed by GR4J, IHACRES and Hillslope models. Model which was least accurate for simulating runoff did not work well for modelling real evapotranspiration and other runoff components neither. An accurate evapotranspiration calculation was not decisive for accurate runoff simulation, and dividing the runoff into different components was the key factor in applicability and accuracy of the models. We also found that the generalized semi-distributed model not only simplified the operation process of the model, but also affected the simulation accuracy. 【Conclusion】Among the 45 conceptual models we compared, MODHYDROLOG, GR4J, IHACRES and Hillslope models worked best for simulating hydrological processes in the Lijiang River Basin and similar basins. |
| Key words: hydrology; models; applicability; basin |
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