The sea surface height data volume of the future wide-swath two-dimensional(2D)altimetric satellite is thousands of times greater than that of nadir altimetric satellites.The time complexity of the 2D altimetry mappin...The sea surface height data volume of the future wide-swath two-dimensional(2D)altimetric satellite is thousands of times greater than that of nadir altimetric satellites.The time complexity of the 2D altimetry mapping reaches O(n^(3)).It is challenging to map the global grid products of future 2D altimetric satellites.In this study,to improve the efficiency of global data mapping,a new algorithm called parallel-dynamic interpolation(PA-DI)was designed.Through the use of 2D data segmentation and fine-grained data mosaic methods,the parallel along-track DI processes were accelerated,and a fast and efficient spatial-temporal high-resolution and low-error enhanced mapping method was obtained.As determined from a comparison of the single-threaded DI with the PA-DI,the new algorithm optimized the time complexity from O(n^(3))to O(n^(3)/KL),which improved the mapping efficiency and achieved the expected results.According to the test results of the observing system simulation experiments,the PA-DI algorithm may provide an efficient and reliable method for future wide-swath 2D altimetric satellite mapping.展开更多
Magnetotelluric sounding method based on the difference of the rock’s resistivity is an exploration method about doing research in earth’s resistivity and phase using the native electromagnetic field. The paper adop...Magnetotelluric sounding method based on the difference of the rock’s resistivity is an exploration method about doing research in earth’s resistivity and phase using the native electromagnetic field. The paper adopts 2D finite element method as the magnetotelluric forward method and calculates the total field by primary field (also named background field) plus secondary field. We can?get more accurate forward result through the finite element method and we can get the result effected by the dense degree of grid slightly by the total field. But the method is not effective?enough when the model is divided into relative big grid. When the frequency changes, program solves relevant equation separately. According to the feature of the algorithm, we apply MPI parallel method in the algorithm. Every process solves relevant equation. The account of frequency?that a process needs to solve in parallel computation is less than the account that the process?needs to solve in serial algorithm. We can see that the forward result is the same with the serial algorithm and proves the correctness of algorithm. We do statistics about the efficiency of the parallel algorithm. When the account of processes is from 2 to 8, the speedup is from 1.63 to 2.64. It proves the effectiveness of the parallel algorithm.展开更多
The authors developed a 3-D numerical injection model on parallel TOUGH2-FLAC3 D based on the site-specific stratigraphic information in Ordos Basin to simulate the Shenhua CO_2 geological storage( CGS)demonstration p...The authors developed a 3-D numerical injection model on parallel TOUGH2-FLAC3 D based on the site-specific stratigraphic information in Ordos Basin to simulate the Shenhua CO_2 geological storage( CGS)demonstration project injection process for three years and forecast CO_2 migration and layers displacement after injection for seven years. The results suggested that CO_2 migration did not stop after three years of consecutive injection,but migration rate was slowing down with time. As a result,displacement near injection well increased with injection and decreased slowly after injection. The maximum displacement of surface center occurred near the end of injection,which was only 1. 24 cm. According to the displacement result,it is safe to continue injecting for this project.展开更多
We put forward a multicore parallel plan for 2D-FFT and implement it on TMS320C6678 DSP after we research thecharacteristics of different multicore DSP programming models and two-dimension FFT (2D-FFT). We bring the...We put forward a multicore parallel plan for 2D-FFT and implement it on TMS320C6678 DSP after we research thecharacteristics of different multicore DSP programming models and two-dimension FFT (2D-FFT). We bring the parallelcomputing capability of multicore DSP into full play and improve working efficiency of 2D-FFT. It has hugely referential valuein implementing image processing arithmetic based on 2D-FFT.展开更多
基金Supported by National High Technology Research and Development Program of China (863 Program) (2007AA04Z239) and National Natural Science Foundation of China (60621001, 60975060)
基金This research was funded by the Key Research and Development Program of Shandong Province(No.2019GH Z023)the National Natural Science Foundation of China(Nos.41906155,42030406)+1 种基金the Fundamental Research Funds for the Central Universities(No.201762005)the National Key Scientific Instrument and Equipment Development Projects of National Natural Science Foundation of China(No.41527901).
文摘The sea surface height data volume of the future wide-swath two-dimensional(2D)altimetric satellite is thousands of times greater than that of nadir altimetric satellites.The time complexity of the 2D altimetry mapping reaches O(n^(3)).It is challenging to map the global grid products of future 2D altimetric satellites.In this study,to improve the efficiency of global data mapping,a new algorithm called parallel-dynamic interpolation(PA-DI)was designed.Through the use of 2D data segmentation and fine-grained data mosaic methods,the parallel along-track DI processes were accelerated,and a fast and efficient spatial-temporal high-resolution and low-error enhanced mapping method was obtained.As determined from a comparison of the single-threaded DI with the PA-DI,the new algorithm optimized the time complexity from O(n^(3))to O(n^(3)/KL),which improved the mapping efficiency and achieved the expected results.According to the test results of the observing system simulation experiments,the PA-DI algorithm may provide an efficient and reliable method for future wide-swath 2D altimetric satellite mapping.
文摘Magnetotelluric sounding method based on the difference of the rock’s resistivity is an exploration method about doing research in earth’s resistivity and phase using the native electromagnetic field. The paper adopts 2D finite element method as the magnetotelluric forward method and calculates the total field by primary field (also named background field) plus secondary field. We can?get more accurate forward result through the finite element method and we can get the result effected by the dense degree of grid slightly by the total field. But the method is not effective?enough when the model is divided into relative big grid. When the frequency changes, program solves relevant equation separately. According to the feature of the algorithm, we apply MPI parallel method in the algorithm. Every process solves relevant equation. The account of frequency?that a process needs to solve in parallel computation is less than the account that the process?needs to solve in serial algorithm. We can see that the forward result is the same with the serial algorithm and proves the correctness of algorithm. We do statistics about the efficiency of the parallel algorithm. When the account of processes is from 2 to 8, the speedup is from 1.63 to 2.64. It proves the effectiveness of the parallel algorithm.
基金Supported by projects of National Natural Science Foundation of China(Nos.41372239,41772238,41602243)
文摘The authors developed a 3-D numerical injection model on parallel TOUGH2-FLAC3 D based on the site-specific stratigraphic information in Ordos Basin to simulate the Shenhua CO_2 geological storage( CGS)demonstration project injection process for three years and forecast CO_2 migration and layers displacement after injection for seven years. The results suggested that CO_2 migration did not stop after three years of consecutive injection,but migration rate was slowing down with time. As a result,displacement near injection well increased with injection and decreased slowly after injection. The maximum displacement of surface center occurred near the end of injection,which was only 1. 24 cm. According to the displacement result,it is safe to continue injecting for this project.
文摘We put forward a multicore parallel plan for 2D-FFT and implement it on TMS320C6678 DSP after we research thecharacteristics of different multicore DSP programming models and two-dimension FFT (2D-FFT). We bring the parallelcomputing capability of multicore DSP into full play and improve working efficiency of 2D-FFT. It has hugely referential valuein implementing image processing arithmetic based on 2D-FFT.