ZHAOZhi-wei,LIHeng,LILi,et al.Construction Method and Suitability Evaluation of Bioretention Facilities on Tropic Coral Islands[J].China Water & Wastewater,2024,40(21):129-136.
Construction Method and Suitability Evaluation of Bioretention Facilities on Tropic Coral Islands
China Water & Wastewater[ISSN:1000-4062/CN:12-1073/TU]
volume:
第40卷
Number:
第21期
Page:
129-136
Column:
Date of publication:
2024-11-01
- Keywords:
- bioretention facility; coral sand; modification of packing medium; analytic hierarchy process
- Abstract:
- Bioretention facilities possess the merits of regulating rainwater runoff, enhancing runoff quality and guaranteeing plant growth, and exhibit a favorable application prospect on tropic coral islands where freshwater resources are scarce. In this paper, seven groups of bioretention facilities with diverse structures were constructed by utilizing coral sand as the matrix and laterite, peat, coconut bran, vermiculite, and biochar as the mixed packing media. The designed catchment area ratio was 1∶10. When the rainfall intensity was 80 mm/h, the average total runoff reduction rate was 52.9%, and when the rainfall intensity was 10-40 mm/h, the total runoff reduction rate reached 100%, suggesting that the constructed bioretention facility possessed a superior runoff reduction capacity. To investigate the retention capacity of rainwater, the variation of moisture content in the planting soil layer was examined. When the planting soil layer consisted of coral sand mixed with laterite, the decrease rate of moisture content in the planting soil layer could be significantly slowed down (0.000 9-0.008 0 h-1), and the decrease rate of moisture content gradually reduced with the increase of depth. The economic cost and other parameters were evaluated using the analytic hierarchy process (AHP). The bioretention facilities featuring the planting soil composed of coral sand mixed with laterite and the filling layer consisting of coral sand mixed with vermiculite obtained the highest comprehensive score, being suitable for application on tropic coral islands.
Last Update:
2024-11-01