Abstract
Anthropic activity affects the hydrogeomorphological quality of fluvial systems. River and valley classifications are fundamental preliminary steps in determining their ecological status, and their prioritization is essential for the proper planning and management of soil and water resources. Given the importance of the High Andean livestock micro-watershed (HAL-MWs) ecosystems in Peru, an integrated methodological framework is presented for morphometric prioritization that uses a Principal Component Analysis (PCA) and Weighted Sum Approach (WSA), geomorphological fluvial classifications (channel, slope, and valley), and hydrogeomorphological evaluations using the Hydrogeomorphological Index (IHG). Of six HAL-MWs studied in Leimebamba and Molinopampa (Amazonas region), the PCWSA hybrid model identified the San Antonio HAL-MW as a top priority, needing the rapid adoption of appropriate conservation practices. Thirty-nine types of river course were identified, by combining 13 types of valley and 11 types of riverbed. The total assessment of the IHG indicated that 7.6% (21.8 km), 14.5% (41.6 km), 27.9% (80.0 km), and 50.0% (143.2 km) of the basin lengths have “Poor”, “Moderate”, “Good”, and “Very good” quality rankings, respectively. The increase in the artificial use of river channels and flood plains is closely linked to the decrease in hydrogeomorphological quality.
Highlights
In 2011, 11% of Earth’s surface and 70% of water extracted from aquifers, rivers, and lakes were purposed for agriculture [1]
The results show Rb values ranging from 2.750 (Atuen HAL-WS) to 5.00 (Timbambo High Andean livestock micro-watershed (HAL-MWs))
Twenty-three types of river typology were identified in the Leimebamba HAL-MWs as a result of the combination of nine types of valley and six types of riverbed characterized in the fluvial typification stage (Figure 7a; Table 12)
Summary
In 2011, 11% of Earth’s surface and 70% of water extracted from aquifers, rivers, and lakes were purposed for agriculture [1]. Hydrogeomorphological evaluations, or any other fluvial studies, must begin with river channel and valley classification [52] This process has been traditionally carried out in accordance with hydrological (ephemeral, intermittent, seasonal, permanent, etc.) and biological parameters, without taking into account geomorphological parameters [53]. An integrated methodological framework for morphometric prioritization, geomorphological river classification, and the hydrogeomorphological evaluation of hydrographic basins is presented This methodology was applied on six High Andean livestock micro-basins (HAL-MW) of high environmental and economic importance located in Leimebamba (Atuén, Cabildo, Pomacochas and Timbambo) and Molinopampa (San Antonio and Ventilla) in Amazonas (northern Peru). This research seeks to provide decision-making tools for river system management and restoration
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