| 1. |
- Thakur, Chandni, et al.
(author)
-
Assessment of Hydrological Changes in Godavari River Basin Under the Impacts of El-Niño
- 2024
-
In: Proceedings of the International Association of Hydrological Sciences (PIAHS). - : Copernicus Publications. - 2199-899X. ; 385, s. 203-209
-
Journal article (peer-reviewed)abstract
- El Niño–Southern Oscillation (ENSO) is the most prominent driver of the inter-annual variability of Indian summer monsoon rainfall (ISMR). This study focuses on understanding the hydrological variations in Godavari River Basin (GRB) due to the weakening of ISMR during El Niño years (1980–2008), using the variable infiltration capacity (VIC) model. The entire basin was discretized into 1325 uniform grids of resolution 0.15°×0.15° (about 16.65 km), and hydrological parameters of the basin were analysed at each grid level for various El Niño events. Based on the Oceanic Niño Index (ONI), obtained from National Oceanic and Atmospheric Administration (NOAA), El Niño events occurred in the past were subclassified into weak (2004 and 2006), moderate (1986, 1994 and 2002), strong (1987 and 1991) and very strong (1982, 1987) events. For this study, VIC model was run for the period 1980–2008 and a composite of El Niño and normal years (1981, 1985, 1989, 1990, 1992, 1993, 1996, 2001 and 2003) was prepared to assess the impacts of El Niño events on the hydrology of GRB. Our results showed a negative correlation of precipitation, abstractions and soil moisture with the increasing magnitude of El Niño events. The quantum of precipitation was reduced during El Niño years compared to normal years, which showed the basin's exposure to more frequent droughts during El Niño events.
|
|
| 2. |
- Thakur, Chandni, et al.
(author)
-
Mitigating El Niño impacts on hydro-energy vulnerability through identifying resilient run-of-river small hydropower sites
- 2024
-
In: Journal of Hydrology. - : Elsevier. - 2214-5818. ; 51
-
Journal article (peer-reviewed)abstract
- Study region: The Godavari River basin (GRB), situated between the geographical coordinates of 73(degrees)21 ' E to 83(degrees)09 ' E and 16(degrees)07 ' N to 22(degrees)50 ' N, India.Study focus: We developed an integrated framework combining the variable infiltration capacity (VIC) model and geospatial tools to identify potential sites for run-of-river small hydropower plants (RoR-SHP) capable of meeting the GRB's energy demands during El Nino events. This study utilized long-term (1951-2020) daily streamflow data, simulated with the VIC model for design discharge computation at 30%, 75%, and 90% flow dependability and provided a thorough assessment of the potential of RoR-SHP in the GRB.New hydrological insights for the region: The analysis revealed the GRB's potential for RoR-SHP development, identifying 226 potential sites based on the head along the river, with a combined power and annual energy generation estimate of 92 MW and 0.4 TWh/yr, respectively, at 90% flow dependability. After meticulous screening, 11 potential sites based on the head and the power potential demonstrated a decline of 46.03%, 37.97%, and 17.77% in annual energy at 30%, 75%, and 90% flow dependability, respectively, leaving nine sites maintaining the firm power (90% flow dependability) even during El Nino years. Our findings underscore the increased risk of power shortages during El Nino years and emphasize the need to develop appropriate strategies to cope with the risks associated with El Nino events.
|
|
