Remote Sensing Monitoring of Water Quality in the Danjiangkou Reservoir
- Article
- Figures
- Metrics
- Preview PDF
- Reference
- Related
- Cited by
- Materials
Abstract:
Danjiangkou Reservoir is the water source area of the Middle Route of the South-to-North Water Transfer Project (MRSTNWTP). Thus, its water quality is of great significance to the project. In this study, we collected two HJ-1A/B remote sensing images of the Danjiangkou Reservoir in March and August, 2012. Combined with the in situ water quality data, retrieval models were established to analyze three water quality variables quantitatively, including the chlorophyll a (Chl_a) concentration, total phosphorus (TP) concentration, and water transparency (SD). The results showed that Chl_a and TP concentrations were much higher in the mouth of Dan region and Han region of the Danjiangkou Reservoir during both the dry and wet seasons, while SD was lower than that in other areas. Principal component analysis of the 14 water quality indicators and the remote sensing interpretation of LULC image in Danjiangkou Reservoir indicated that TP mainly comes from the domestic sewage and urban wastewater during the dry season, and from agriculture non-point source pollution during the wet season. The retrieval results of SD indicated that water loss and soil erosion in the upstream of Han River have negative effects on the water clarity of the Danjiangkou Reservoir, resulting in a lower SD in Han region than that in Dan region. Sediment deposition caused by soil erosion may decrease the storage capacity of the Danjiangkou Reservoir and endanger the safety of the MRSTNWTP. The retrieval results of Chl_a were used to analyze the water tropic status in Danjiangkou Reservoir, which indicated that Danjiangkou Reservoir was lightly eutrophicated in the mouth of the Dan region and Han region and some small water bodies. Thus, controlling the non-point source pollution in the upstream of Han River and ecological environment restoration should be implemented for water source conservation in the reservoir.
Keywords:
Project Supported:
Clc Number:
Mobile website
® 2024 All Rights Reserved
冀公网安备13010502002656号
冀公网安备13010502002656号