Hydrological Response to Predominant Land Use and Land Cover in the Colombian Andes at the Micro-Watershed Scale

Land Pub Date : 2024-07-25 DOI:10.3390/land13081140
Henry Garzón Sánchez, Juan Carlos Loaiza Usuga, Jaime Ignacio Vélez Upégui
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Abstract

The hydrological response (HR), generally defined as the relationship between rainfall and runoff, should be understood holistically within the processes of the conversion of rainfall to evapotranspiration, surface and subsurface runoff, groundwater flow, and streamflow. The objective of this study was to evaluate the HR of three predominant land use and land cover (LULC) types in the Colombian Andes at the micro-watershed scale. Experimental micro-watersheds were established to replicate LU (pasture, and a coffee agroforestry system) and LC (natural forest). The TETIS model was applied, calibrated, and verified, and the similarity between observed flows (using level sensors and volumetric gauges) and flows simulated by the model was evaluated, relating the HR to each type of LULC. The HR included an analysis of the Water Retention and Regulation Index—IRH and Base Flow Index—IFB. The best model fit and HR were found for the agroforestry system, with a moderate NSE (0.48), R2 (0.7), RMSE (0.2), and BE (20.8%). On the other hand, a forest cover was found to guarantee the permanence of subsurface inputs and base flows to the river, as evidenced by high IRH, IFB, and water balance values. Natural forest land uses present high volumetric moisture content in the soil, corresponding to a high IFB.
哥伦比亚安第斯山区微流域尺度上主要土地利用和土地覆盖的水文响应
水文响应(HR)一般定义为降雨与径流之间的关系,应在降雨向蒸散、地表和地下径流、地下水流和溪流的转化过程中全面理解。本研究的目的是评估哥伦比亚安第斯山脉三种主要土地利用和土地覆被类型(LULC)在微流域尺度上的 HR。建立了实验性微流域,以复制 LU(牧场和咖啡农林系统)和 LC(天然林)。对 TETIS 模型进行了应用、校准和验证,并评估了观测流量(使用水位传感器和体积测量仪)与模型模拟流量之间的相似性,将 HR 与每种 LULC 类型联系起来。HR 包括对水量保持和调节指数-IRH 和基流指数-IFB 的分析。农林系统的模型拟合度和 HR 值最佳,NSE(0.48)、R2(0.7)、RMSE(0.2)和 BE(20.8%)适中。另一方面,森林植被保证了河流地下输入和基流的持久性,这一点可以从较高的 IRH、IFB 和水平衡值中得到证明。天然林地的土壤容积含水量高,因此 IFB 值也高。
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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