Evaluation and Validation of Estimated Sediment Yield and Transport Model Developed with Model Tree Technique

This study evaluated the applicability of existing sediment yield and transport estimation models developed using data mining classification and prediction techniques and validated them. Field surveys were conducted by using an acoustic Doppler current profiler and laser in situ scattering and transmission at measuring points in the main stream of the Nakdong River located where the tributaries of the Geumho, Hwang, and Nam Rivers join. Surveys yielded estimations of water velocity, discharge, and suspended sediment concentrations were measured. In contrast with models based on the general watershed characteristics factors, some models based on hydraulic explanatory flow variables demonstrated an excellent predictability. This is because the selected submodels for validation, which provided excellent prediction results, were based on a large number of calibration data. It indicates that a sufficient number of reliable data is required in developing a sediment yield estimation model using data mining. For practical applications of data mining to extant sediment yield estimation models, comprehensive considerations are required, including the purpose and background of model development, and data range. Furthermore, the existing models should be periodically updated with the consideration of temporal and spatial lumping problems.

Automated summary

This study assessed the applicability of sediment yield and transport estimation models developed using data mining techniques and validated them through field surveys. Models based on hydraulic explanatory variables showed excellent predictability due to the large amount of calibration data used. Sufficient reliable data is necessary in developing sediment yield estimation models using data mining. Practical applications of data mining in existing models require comprehensive considerations of the purpose, background, and data range, as well as periodic updates to address temporal and spatial lumping issues.