Longitudinal Sediment Profiling and Capacity Lost in Reservoir Using Multidate Sentinel-2 Images
- PDF / 4,573,589 Bytes
- 7 Pages / 595.276 x 790.866 pts Page_size
- 113 Downloads / 178 Views
RESEARCH ARTICLE
Longitudinal Sediment Profiling and Capacity Lost in Reservoir Using Multidate Sentinel-2 Images S. Jagannathan1 • M. Krishnaveni1 Received: 11 July 2019 / Accepted: 10 September 2020 Ó Indian Society of Remote Sensing 2020
Abstract Periodical monitoring is needed for reservoirs to ensure proper management against sedimentation. The amount of sediment retained by the reservoir or the amount of volume lost is the major factor to be assessed during monitoring. This study assesses the reservoir sedimentation of the Wellington Reservoir using Satellite Remote Sensing. The analysis was carried out using eight sentinel 2 images for the hydrologic years 2016–2017. The water spread area was acquired from satellite data based on supervised classification. The water level was found to be in fluctuation between 1.94 and 4.94 m in the period of data. Polynomial regression equations were used in finding the relation between the depths: water spread area and volume of reservoir. From the study, it was found that due to sedimentation, the gross storage capacity of the Wellington Reservoir has reduced from 73.05 to 52.56 Mm3 and the loss due to sedimentation is 28.04% in 92 years. Keywords Remote sensing Reservoir sedimentation Sentinel images Storage capacity Supervised classification Wellington Reservoir
Introduction Sediments are considered to be an undesirable and unavoidable consequence in the storage of water (Palmieri et al. 2001). When the velocity of flow decreases, the coarse particles (gravel and sand) are deposited and become the deltaic region in the upstream part of the reservoir (Juracek 2015). Globally about 50 km3 of water storage capacity is lost due to sedimentation every year (Mahmood 1987). Annual loss due to sedimentation is between 0.5 and 1% of global water storage (White 2001). The sediment accumulation in Asian countries is more than about 0.8% of total storage (ICOLD. 2009). Effects of damages due to dam failure by natural hazards or faulty design can be taken care by modern engineering, but the major threat is reservoir sedimentation to the productivity of dams (Sumi and Hirose 2009). The rate of dam construction has declined since 1980, and the need for water storage area is increasing for the growing population and if the society continues allowing to shrink the demand for & S. Jagannathan [email protected] 1
water will eventually overcome the supply, creating a worldwide water crisis (George Annandale 2013). Many reservoirs have neglected implementing sediment management practices to counteract consequences due to sedimentation (Kondolf et al. 2014). In India, based on the sedimentation rate of 239 reservoirs, the computed average annual percentage loss in gross storage due to siltation is 0.42% (CWC 2015). A sustainable approach must have a sediment management plan either to address the mitigation of sediment or provide a monetary support for the mitigation of sediment (George et al. 2016). The volume lost, sediment pattern and areas of desilting within the rese
Data Loading...
