Machine-learning methods for hydrological imputation data: analysis of the goodness of fit of the model in hydrographic systems of the Pacific - Ecuador

• Main Authors: Diego Heras, Carlos Matovelle
• Format: Article
• Language: English
• Published: Instituto de Pesquisas Ambientais em Bacias Hidrográficas (IPABHi) 2021-06-01
• Series: Revista Ambiente & Água
• Subjects: data imputation; hydrographic systems; machine learning
• Online Access: https://www.scielo.br/j/ambiagua/a/m3nQgWQLmhHqPghwMKHtnNP/?lang=en

Computational methods based on machine learning have had extensive development and application in hydrology, especially for modelling systems that do not have enough data. Within this problem, there are data series that are missing, and that should not necessarily be discarded; this is achieved by means of the imputation of the same ones, obtaining complete sets. For this reason, this research proposes a comparison of computer-learning techniques to identify those best suited for hydrographic systems of the Pacific of Ecuador. For the elaboration of this investigation, the hydro-meteorological records of the monitoring stations located in the watersheds of the Esmeraldas, Cañar and Jubones Rivers were used for 22 years, between 1990 and 2012. The variables that were imputed were precipitation and flow. Automatic learning machines of the Python Scikit_Learn module were used; these modules integrate a wide range of automated learning algorithms, such as Linear Regression and Random Forest. Finally, results were obtained that led to a minimum useful mean square error for Random Forest as an automatic machine-learning imputation method that best fits the systems and data analyzed.