Abstract
Danjiangkou Reservoir is water source of Middle Route Project of the South-to-North Water Diversion (SNWD) Project, research on the dynamic changes in the water storage within the Danjiangkou Reservoir constitutes an important guide for reservoir water volume management practices. A practical method for estimating the water storage and its dynamics was proposed in this study based on inundated areas from Moderate Resolution Imaging Spectroradiometer (MODIS) observations between 2000 and 2016. The results show that the mean Danjiangkou Reservoir water storage was 10.548 billion m3 year−1. Significant seasonal changes (ρ < 0.01 in t-test) were observed with annual minima (~9.610 billion m3) occurring between February to July and annual maxima (~11.514 billion m3) occurring from August to the following January. Based on the monthly changes in the probability of the water supply, the guaranteed rate of water supply in the second half year (July–December) was higher than that during the first half year (January–June). The water supply in May was greatly deficient. In addition, the full guaranteed rate of the water supply over the past 17 years only accounted for 17.6%. Therefore, reservoir management practices should reduce the water released prior to May and reserve enough water according to the demands of water receiving areas to improve the efficiency of water resource utilization.
Highlights
Due to the influences of climatic conditions, human regulations, and many other factors, both rapid fluctuations and secular evolution in the reservoir water storage are prominent
The Danjiangkou Reservoir of which is greater than the elevation of the reservoir digital elevation model (DEM) grid cell was divided into three parts according to the different characteristic of the bottom topography: the main Danjiangkou reservoir (MDR), the western Danjiangkou reservoir (WDR) and the northern Danjiangkou reservoir (NDR)
A total of 415 composites were downloaded from the NASA Land Processes Distribution Active Archive Center, including Terra data from 2000 to 2016.The Moderate Resolution Imaging Spectroradiometer (MODIS) 8-day composite products represent the best possible observations during an 8-day period, as they are characterized by high observation coverage, low viewing angle, absence of clouds, etc
Summary
Due to the influences of climatic conditions, human regulations, and many other factors, both rapid fluctuations and secular evolution in the reservoir water storage are prominent. Digital photogrammetry can be employed to collect topographic data of reservoir areas during low flows to form a model of the reservoir bottom elevation and calculate the reservoir storage using water level data through an application of the section method[13]. The advantage of this method is that it can obtain reservoir storage results with greater accuracy, which is related to the accuracy of the topography at the bottom of the reservoir. This process was repeated to modify the threshold by comparing with the RGB true color composites
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