The implementation period of this project is from May 18, 2021 to May 17, 2022. All work items have been accomplished and the first draft of term report was submitted by April 27, 2022 in accordance with the project contract requirements. After receiving the opinions and suggestions from scholars and commissioners on May 9, 2022, this project modified the term report and replied to scholars’ and commissioners’ opinions and suggestions, and submitted their consent replies to the bureau for review on May 24. Extracts of the enforcement results of all work items are shown as follows:
This project monthly utilized drone photography capacity of unmanned aerial vehicle (UAV) to grasp the distribution of exposed riverbed of Gaoping River in a rolling manner and urging the river management offices to finish exposed riverbed improvement earlier under the concept of preventive deployment. A total of 792.2 hectares of exposed reverbed have been improved in the period from January to December 2021, which is 18% higher compared with that in the same period of 2020 and the most improvement areas for exposed reverbed in the recent five years, and correspond to 19.13 tons of PM10 emission reduction based on their actual control periods.
The highest maximum hourly average concentration is 83 μg/m3 based on analyses of four river dust early-warning episode days for the period from January to December 2021, which is 81% lower compared with the highest maximum hourly average concentration 440 μg/m3 of three river fugitive dust episode days that happened in 2020. Furthermore, this project has utilized ISCST3 Dispersion Model with four times (May 19, July 7, July 22 and July 23, 2021) of river dust early-warning data provided by Environmental Protection Administration (EPA) to simulate the PM10 incremental concentrations at monitoring stations and potential impact levels for six times in a rolling manner and also compared the simulation results with UAV aerial photographs to analyze the critical exposed riverbed that may cause river fugitive dust events. This project has offered river management offices related information to go forward preventive dust control operations so that the river dust influence concentration or occurrence probability may decrease. This is the first time in the last decade that Gaoping River achieves no river fugitive dust episode day for a full year.
As regards the environmental cleanup, this project has finished 3,110.9 kilometers of river dust environmental cleanup with a total PM10 emission reduction of about 8.1 tons. With respect to the river dust educational propaganda, three educational training sessions or propaganda of river dust for villages along the Gaoping River, two educational propaganda of river dust for schools and a river dust pre-notification and self-protection drill were held this year. Through the questionnaire survey after the educational propaganda, 97% of the respondents give positive evaluation to Environmental Protection Bureau, Pingtung County Government for promoting related works regarding river fugitive dust control. Furthermore, according to the results of the public satisfaction survey executed by Nsysu Survey Center, the respondents give this county a positive rating of 79% on the comprehensive improvement of river dust, which is 13% higher compared with that in 2020(66%) and consistent with the result of this project’s questionnaire survey. It also shows that the public is satisfied with the county’s administration. As for 2021 EPA evaluation, the achieving rates for the two items regarding river dust improvement are both 100%.