Mincon (Ireland)

River hydraulic modelling is challenging due to the difficulty of accurately replicating hydraulic behaviors and matching simulated water levels with recorded measurements, necessitating rigorous calibration feasibility assessments.In this study, we present a novel approach to determine the calibration limit for sub-catchments in a river basin using an equation derived from Continuity, Conveyance, Froude, and Manning's formulae.The slope parameter, derived under the assumption of critical flow conditions, serves as an indicator for calibration feasibility.If the river slope exceeds the critical slope, calibration is deemed impossible due to the supercritical conditions.This approach was tested in the Sungai Pahang Basin as a case study.Preliminary results confirmed the methodology's effectiveness in identifying calibration limits, proving that it is a useful tool for determining the feasibility of calibration.This method can save time and resources by identifying infeasible calibration scenarios early in the modelling process.

This study evaluates the catchment characteristics of the Pahang River Basin and its sub-basins in Pahang state, Peninsular Malaysia, utilizing GIS techniques and IFSAR-DEM data.Parameters such as stream order, shape, steepness, branching, dissection, and watershed elongation were analyzed to offer foundational insights into the basin's morphology and hydrological processes.These insights are crucial for development, management, and conservation planning.Notably, the Jelai, Lower Pahang, and Tembeling basins play a significant role in contributing runoff downstream, with dendritic patterns and moderate bifurcation ratios observed.The ongoing erosion and deposition processes, particularly in the meandering sections of the Pahang River, emphasize the dynamic nature of this landscape.These findings highlight the critical role of morphometric analysis in sustainable catchment management.Future research should further explore the spatial and relief aspects of the Pahang River basin, as well as its textural, material, and permeability characteristics, to inform and enhance watershed management strategies.