Hydrological modeling using HEC-HMS model, case of Tikur Wuha River Basin, Rift Valley River Basin, Ethiopia

Q2 Environmental Science Environmental Challenges Pub Date : 2024-09-21 DOI:10.1016/j.envc.2024.101017
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Abstract

Modeling rainfall-runoff is widely recognized as one of the most complex types of hydrological modeling, primarily because it involves the integration of a diverse array of watershed characteristics. Due to its ability to emulate the hydrological behavior of a watershed, the modeling of rainfall-runoff plays a crucial role in predicting the runoff generated at the watershed's outlet. The present study aimed to simulate runoff by utilizing HECHMS in the Tikur Wuha River watershed situated in the Rift Valley Basin of Ethiopia. To achieve this goal, tools such as HEC-GeoHMS and ArcGIS were employed to establish the necessary input parameters for HECHMS. Various methods were implemented at different stages of the modeling process, including SCS-CN for estimating precipitation loss, SCS-UH for transforming excess rainfall, Muskingum for flood routing, and the monthly constant method for modeling base flow. The process of calibration and validation entailed the use of daily observed flow data from the periods (1990 to 2009) and (2010 to 2015) correspondingly. Nash Sutcliff Efficiency (NSE) and coefficient of determination (R2) were employed as metrics to evaluate the model's performance. The findings showed that the model exhibited high performance in both calibration and validation stages, producing values of (NSE = 0.83, R2 = 0.91) and (NSE = 0.84, R2 = 0.86) respectively. Furthermore, the Percent Bias (PBIAS) values in calibration and validation remained within acceptable ranges, registering at 2.69 % and 4.67 % respectively. After the calibration and validation of the model, the estimated peak flood discharge simulated by the model (206.3m3/s) was compared with the observed stream flow (197.1m3/s), indicating a significant similarity between the model's output and the observed data. Consequently, it can be inferred that the model exhibits a high capability in replicating hydrological parameters effectively for the Tikur Wuha watershed and other watersheds sharing similar hydrological characteristics.
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使用 HEC-HMS 模型建立水文模型,埃塞俄比亚裂谷河流域 Tikur Wuha 河流域案例
降雨-径流建模被公认为是最复杂的水文建模类型之一,主要是因为它涉及到各种流域特征的整合。由于降雨-径流模型能够模拟流域的水文行为,因此在预测流域出口处产生的径流方面发挥着至关重要的作用。本研究旨在利用 HECHMS 对位于埃塞俄比亚裂谷盆地的 Tikur Wuha 河流域进行径流模拟。为实现这一目标,采用了 HEC-GeoHMS 和 ArcGIS 等工具来建立 HECHMS 的必要输入参数。在建模过程的不同阶段采用了各种方法,包括估算降水损失的 SCS-CN、转换过量降雨的 SCS-UH、洪水路径的 Muskingum 以及模拟基本流量的月常数法。在校准和验证过程中,需要使用相应时期(1990 年至 2009 年)和(2010 年至 2015 年)的每日观测流量数据。纳什-苏特克里夫效率(NSE)和决定系数(R2)被用作评估模型性能的指标。研究结果表明,该模型在校准和验证阶段均表现出较高的性能,其值分别为(NSE = 0.83,R2 = 0.91)和(NSE = 0.84,R2 = 0.86)。此外,校准和验证的偏差百分比 (PBIAS) 值仍在可接受范围内,分别为 2.69 % 和 4.67 %。在对模型进行校核和验证后,将模型模拟的估计洪峰流量(206.3 立方米/秒)与观测到的河水流量(197.1 立方米/秒)进行比较,结果表明模型的输出结果与观测到的数据非常相似。因此,可以推断该模型在有效复制提库尔乌哈流域及其他具有类似水文特征的流域的水文参数方面具有很强的能力。
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来源期刊
Environmental Challenges
Environmental Challenges Environmental Science-Environmental Engineering
CiteScore
8.00
自引率
0.00%
发文量
249
审稿时长
8 weeks
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