Assessing hydrological changes in a regulated river system over the last 90 years in Rimac Basin (Peru)

Abstract

Hydrological changes were assessed considering possible changes in precipitation and regulation or hydraulic diversion projects developed in the basin since 1960s in terms of improving water supply of the Rimac River, which is the main source of fresh water of Peru's capital. To achieve this objective, a trend analysis of precipitation and flow series was assessed using the Mann-Kendall test. Subsequently, the Ecoflow and Indicators of Hydrologic Alteration (IHA) methods were applied for the characterization and quantification of the hydrological change in the basin, considering for the analysis, a natural period (1920-1960) and an altered period (1961-2012). Under this focus, daily hydrologic information of the BChosica R-2^station (from 1920 to 2013) and monthly rainfall information related to 14 stations (from 1964 to 2013) were collected. The results show variations in the flow seasonality of the altered period in relation to the natural period and a significant trend to increase (decrease) minimum flows (maximum flows) during the analyzed period. The Eco-flow assessment shows a predominance of Eco-deficit from December to May (rainy season), strongly related to negative anomalies of precipitation. In addition, a predominance of Eco-surplus was found from June to November (dry season) with a behavior opposite to precipitation, attributed to the regulations and diversion in the basin during that period. In terms of magnitude, the IHA assessment identified an increase of 51% in the average flows during the dry season and a reduction of 10% in the average flows during the rainy season (except December and May). Furthermore, the minimum flows increased by 35% with shorter duration and frequency, and maximum flows decreased by 29% with more frequency but less duration. Although there are benefits of regulation and diversion for developing anthropic activities, the fact that hydrologic alterations may result in significant modifications in the Rimac River ecosystem must be taken into account.

Analysis of Streamflow Variability and Trends in the Meta River, Colombia

“…Their findings have identified a downward trend in the interannual average streamflow for the upper section of the river and strong effects caused by El Niño Southern Oscillation (ENSO) events. Vega-Jácome et al [15] assessed hydrological changes caused by variations in the precipitation regime or by hydraulic structures in the Rimac River basin, the primary freshwater source of Lima. These authors found that regulation and diversion projects had a significant effect on increasing minimum flows and decreasing maximum flows but raised questions about ecosystem alteration issues.…”

Analyzing Changes in the Flow Regime of the Yangtze River Using the Eco-Flow Metrics and IHA Metrics

“…Gao et al [18] suggested that the ecodeficit and ecosurplus were good representations of the degree of hydrologic alteration and were well correlated with the parameters of the IHA metrics. The eco-flow metrics have been successfully applied for analyzing flow regime changes in different regions [20][21][22]. Gao et al [23] and Wang et al [24] found that the eco-flow metrics can describe changes in the hydrological parameters of groups 1 and 2 of the IHA metrics (i.e., the magnitude of monthly runoff and the magnitude of extreme runoff, respectively).…”

Increased El Niño amplitude during the last deglacial warming

“…The core M77/2-005-3 off Callao receives a Ti flux primarily from the discharge of the rivers Chancay, Chillón, Rimac, and Lurín, while the G14 core off Pisco is influenced by the Pisco and Ica rivers. Under the current climate, the flow of coastal rivers is usually low and increases during austral summer because of the monsoon rainfall in the High Andes 3,27,28 . During El Niño events, especially those with high sea surface temperature (SST) anomalies in the Eastern Pacific (EP), strong thunderstorms and precipitation occur on the coast 5,29,30,31,32 .…”