Subtopic 2: Spatial and temporal evolution characteristics and ecological effects of water resources and prediction of future scenarios.
Leader: Junguo Liu, Yanfang Sang
Participating organization:
Institute of Geographic Sciences and Resources, CAS
Southern University of Science and Technology
Beijing Normal University
Timeline of the project:
The project implementation launch meeting was held in April 2018;
The first field investigation, investigation and sampling of the research area was completed in July 2018.
The collection and treatment of groundwater with high arsenic content was completed in October 2018.
Water resources model selection was completed in October 2018;
The construction of MySQL database platform was completed in November 2018;
Completed the annual progress report in December 2018.
Mainly in these aspects:
Field investigation, data collection as well as database building.
From May 18 to 23, 2018, field investigation and research work was carried out in Cambodia, mainly investigating hydrological, water quality, geological and water environment problems around Phnom Penh, Pongching-Yang and bodhisattva.
From August 11 to 17, 2018, a field survey was carried out in Laos, focusing on the basic conditions of water resources, hydropower stations, water resources utilization, ecological environment and urbanization in Laos.
Field investigation and sampling were carried out in Cambodia from November 9-14, 2018, mainly investigating the drinking water sources and groundwater pollution of Kampong Cham, Ganda and Kampong Cham in three villages near Phnom Penh, Cambodia, and collecting groundwater, paddy field and rice samples from different locations according to the concentration gradient of groundwater arsenic in the model.
Regional meteorological data, hydrological data, socio-economic data, microwave remote sensing inversion data of soil moisture content, water use data, groundwater data, DEM and land use data have been collected ,including:
Meteorological data:
5 sets of raster data with accuracy above 0.5 degree; Time span 1901-2010; The time accuracy is the daily scale.
Remote sensing data:
5 sets of 25km, 3km and 250m spatial accuracy data; Time span from 1991 to 2018; The time accuracy is 8 days and moon scale.
Hydrological data:
Daily/monthly runoff data of 19 hydrological stations; Basic information and data of 470 DAMS from 1956 to 2018.
Groundwater data:
Groundwater quality data of 114,918 sites (including arsenic, iron, chlorine plasma concentration, ph, turbidity and other indicators).
Socio-economic data:
Population GDP data (1960-2017, national scale), water use data (1980-2017, 3 sectors), disaster data (1961-2017).
Other data:
DEM3 set (SRTM: 30m; ASTER: 90m; GTOPO30:1 km), land use data (GLC30:30 m, phase 2; Mekong river commission: 300 m, multi-phase)
Development of hydrological model under natural - human coupling system:
Used Python3.6 language, a new generation of high-precision distributed hydrological model was developed under the framework of the nature-human coupling system, which can dynamically simulate the water storage in the root soil layer.
Based on support vector machine (SVM), sentinel-2, Landsat and other satellite remote sensing multi-spectral image data, a high-resolution water extraction method MuWI was constructed to improve the accuracy of remote sensing water extraction under complex terrain.
Based on Landsat satellite data with spatial resolution of 30m in the older time series from 1988 to 2018 and MODIS satellite data with spatial resolution of 250 meters from 2000 to 2018, NDVI and NDWI were used to analyze the changes of lake surface area in Tonle SAP lake in a long time series.
Using GRACE data, the spatial and temporal evolution patterns of water reserves in four basins originating from the qinghai-tibet plateau are inversed.
A preliminary online monitoring system for the hydrological situation of the Lancang-Mekong river basin has been established.
The future socio-economic scenarios of southeast Asian countries are constructed and the impacts of socio-economic activities on runoff in Lancang-Mekong river basin are preliminarily evaluated.
Important results and international impacts
From August 11 to 17, 2018, China assisted in organizing an international conference on "land cover/land use change and water-energy-food nexus in southeast Asia" in Laos
Prepared SCI special issue with the theme of "evaluation and management of water resources in the nature-humanity coupling system"
At the invitation of chief editor Monica Conteabile, a paper entitled "water resources and sustainable development" for the journal Nature Sustainability was submitted and under revision.
On October 21, 2018, Prof. Junguo Liu was invited to give the first report of the NGO Beijing international dialogue "One Belt and One Road and cooperation on people's livelihood", and his visits to Cambodia and Laos were highlighted.
On November 1-2, 2018, the ministry of water resources and yunnan province hosted the first Lancang-Mekong water resources cooperation BBS, inviting professor Junguo Liu to deliver a report on the water-energy-food bond in the Lancang-Mekong river basin.