Shyamal Karmakar, Srijon Datta, Marjena Beantha Haque, Ayub Parvez, Mir Enamul Karim, Abdullah Al Mamun, M Shafiul Alama and M Mozzaffar Hossain
Link: https://doi.org/10.13140/RG.2.2.22918.45122
Abstract
Developing and testing hydrological models in data poor regions is vital to support water management facilities. Quantum-GIS was integrated to the Soil and Water Assessment Tool (SWAT) to simulating streamflow and sediment transport in Halda Basin using MERIT Digital Elevation Models (DEMs). This hydrological model used 1990-1992 as the observation and 1993-1997, 1999-2001 as calibration and validation period. The models evaluation parameters R2 value 0.85 and 0.80, NS value 0.84, 0.79 for calibration and validation using streamflow of Panchapukuria station suggested a very good agreement in seasonal cycle and most of the monsoon stream flow. The streamflow/precipitation ratio indicates significant influence to groundwater through infiltration. The baseflow is decreasing and significantly affected by the dam construction. This study could serve as a baseline for scenario modelling (e.g. , climate change), environmental flow estimation for fish habitat, freshwater supply, irrigation and salinity intrusion.
Shyamal Karmakar, Srijon Datta, Marjena B. Haque, Iftekhar S. Khan, Md. Abu Syed
Link: https://www.researchgate.net/publication/390944224_EFFECTS_OF_SRM_ON_THE_HYDROLOGY_OF_MEGHNA_RIVER_BASIN
Abstract
Meghna and Brahmaputra are two transboundary rivers that drain through Bangladesh to reach the Bay of Bengal, where the upper basins are shared by India, India and China, respectively, joined Ganges-Padma to become fifth largest river basin with highest inhabitation in planet earth. This two neighboring watershed share the most precipitation as monsoon (June-September) due to its orographic barrier. We have used QSWAT, a semi-distributed physical model using standard soil, land use, and elevation dataset of baseline 2010, to set a hydrological model for historical phase, 2001-2020, control phase (2020-2035), and three SRM phases, 2036-2050, 2051-2070, and 2071-2099. The daily river discharge of the Meghna River was calibrated at the downstream discharge point, Bhoirab bazar, Bangladesh where smaller sub-basin discharge also compared. Five ESMs (MPI-LR, UKESM, IPSL CESM2, and CNRM) simulated data of G6Sulfur SRM scenarios were compared with two emission scenarios, SSP245 and SSP585. Monsoon discharge varies significantly, followed by the post-monsoon discharge. Each sub-basin yearly mean surface runoff of hydrological simulation showed significant changes in four sub-basin during SRM phase III compared to SSPs.