Modelling Hydrologic Processes in the Mekong River Basin Using a Distributed Model Driven by Satellite Precipitation and Rain Gauge Observations

Autor: Dawen Yang, Bin Gao, Xueting Peng, Zhiguo Pang, Yang Jiao, Khem Sothea, Hui Lu, Wei Wang
Jazyk: angličtina
Rok vydání: 2016
Předmět:
Atmospheric Science
010504 meteorology & atmospheric sciences
Calibration (statistics)
Hydrological modelling
Rain
Climate Change
0208 environmental biotechnology
Climate change
Marine and Aquatic Sciences
Social Sciences
lcsh:Medicine
02 engineering and technology
Structural basin
Research and Analysis Methods
Human Geography
01 natural sciences
Remote Sensing
Meteorology
Rivers
Natural Resources
Land Use
lcsh:Science
Asia
Southeastern

0105 earth and related environmental sciences
Climatology
Multidisciplinary
Rain gauge
Geography
Distributed element model
Simulation and Modeling
Ecology and Environmental Sciences
lcsh:R
Aquatic Environments
Models
Theoretical

Bodies of Water
020801 environmental engineering
Water resources
Data quality
Earth Sciences
Water Resources
Environmental science
Engineering and Technology
lcsh:Q
Hydrology
Research Article
Freshwater Environments
Zdroj: PLoS ONE, Vol 11, Iss 3, p e0152229 (2016)
PLoS ONE
ISSN: 1932-6203
Popis: The Mekong River is the most important river in Southeast Asia. It has increasingly suffered from water-related problems due to economic development, population growth and climate change in the surrounding areas. In this study, we built a distributed Geomorphology-Based Hydrological Model (GBHM) of the Mekong River using remote sensing data and other publicly available data. Two numerical experiments were conducted using different rainfall data sets as model inputs. The data sets included rain gauge data from the Mekong River Commission (MRC) and remote sensing rainfall data from the Tropic Rainfall Measurement Mission (TRMM 3B42V7). Model calibration and validation were conducted for the two rainfall data sets. Compared to the observed discharge, both the gauge simulation and TRMM simulation performed well during the calibration period (1998–2001). However, the performance of the gauge simulation was worse than that of the TRMM simulation during the validation period (2002–2012). The TRMM simulation is more stable and reliable at different scales. Moreover, the calibration period was changed to 2, 4, and 8 years to test the impact of the calibration period length on the two simulations. The results suggest that longer calibration periods improved the GBHM performance during validation periods. In addition, the TRMM simulation is more stable and less sensitive to the calibration period length than is the gauge simulation. Further analysis reveals that the uneven distribution of rain gauges makes the input rainfall data less representative and more heterogeneous, worsening the simulation performance. Our results indicate that remotely sensed rainfall data may be more suitable for driving distributed hydrologic models, especially in basins with poor data quality or limited gauge availability.
Databáze: OpenAIRE