Structural improvement of a kinematic wave-based distributed hydrologic model to estimate long-term river discharge in a tropical climate basin

IF 0.6 Q4 WATER RESOURCES Hydrological Research Letters Pub Date : 2020-01-01 DOI:10.3178/hrl.14.104
Thatkiat Meema, Y. Tachikawa
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引用次数: 2

Abstract

: A distributed hydrologic model based on a kinematic wave approximation with surface and subsurface flow com‐ ponents is applicable to basins that have temperate climatic conditions similar to those in Japan. However, it is difficult to present long-term river discharge using the existing model structure in basins with different climatic conditions. This study aims to improve the model structure for better estimates of long-term discharge in the Nam Ngum River, the main tributary of the Mekong River, by incorporating bedrock aquifers as part of the slope flow component of the original model structure. Three bedrock groundwater struc‐ tures are configured to incorporate the original model structure. The results show that a combination of the origi‐ nal model component and one unconfined aquifer structure are the best representations of the river flow regime from the original model structure, in which the rate of infiltration from the layer into the bedrock aquifer was calculated using vertical hydraulic conductivity. The Nash–Sutcliffe efficiency coefficient of the original and improved models increased from 0.80 to 0.86 during the calibration period and from 0.56 to 0.62 during the validation period. The results of this study show that the improved model structure is applicable for long-term hydrologic predictions in South‐ east Asian catchments with distinct dry and rainy seasons.
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基于运动波的分布水文模型在热带气候流域长期河流流量估算中的结构改进
基于运动波近似和地表及地下流分量的分布式水文模型适用于气候条件与日本相似的温带流域。然而,在不同气候条件的流域,现有的模型结构难以反映长期的河流流量。本研究旨在通过将基岩含水层作为原始模型结构的坡流组成部分,改进模型结构,以便更好地估计湄公河主要支流南江的长期流量。三个基岩地下水结构被配置为包含原始模型结构。结果表明,原始模型成分和一个无约束含水层结构的组合是原始模型结构中河流流动状况的最佳代表,其中从该层到基岩含水层的入渗速率是使用垂直水力导率计算的。原始模型和改进模型的Nash-Sutcliffe效率系数在校正期间从0.80增加到0.86,在验证期间从0.56增加到0.62。研究结果表明,改进后的模型结构适用于具有明显旱季和雨季的东南亚流域的长期水文预测。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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来源期刊
CiteScore
1.90
自引率
18.20%
发文量
9
审稿时长
10 weeks
期刊介绍: Hydrological Research Letters (HRL) is an international and trans-disciplinary electronic online journal published jointly by Japan Society of Hydrology and Water Resources (JSHWR), Japanese Association of Groundwater Hydrology (JAGH), Japanese Association of Hydrological Sciences (JAHS), and Japanese Society of Physical Hydrology (JSPH), aiming at rapid exchange and outgoing of information in these fields. The purpose is to disseminate original research findings and develop debates on a wide range of investigations on hydrology and water resources to researchers, students and the public. It also publishes reviews of various fields on hydrology and water resources and other information of interest to scientists to encourage communication and utilization of the published results. The editors welcome contributions from authors throughout the world. The decision on acceptance of a submitted manuscript is made by the journal editors on the basis of suitability of subject matter to the scope of the journal, originality of the contribution, potential impacts on societies and scientific merit. Manuscripts submitted to HRL may cover all aspects of hydrology and water resources, including research on physical and biological sciences, engineering, and social and political sciences from the aspects of hydrology and water resources.
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