The Lam Tsuen River has an area of 424 hectares and exhibits significant differences in “nature-village-urban”. Although many monitoring data have been obtained since 2020 and 2024, there is still not enough integrated results yet. Reviewing existing research, comparing the key effects, and re-analysing the five-year official-monitoring data in this paper. A systematic review of the literature (1986-2025). Collecting monthly water quality data at five observation points (TR12C, TR12D, TR12F, TR12G and TR12H) via EPD records and the CSDI database. Mann-Kendall test; Descriptive analysis method; t-test; Curve fitting methodology. Results show that there are indeed spatial differences caused by urbanisation, but TR12C station at the upstream is obviously abnormal for ammoniacal nitrogen, indicating localised single-pollutant points; There are two obvious changes of suspended solids: first during summer which is likely due to non-point sources; Then downstream stations have relatively significant reduction in ammonia nitrogen and increased concentration of dissolved oxygen (p<0.05); A nonlinear relationship between built-up area ratio and ammonia-nitrogen concentration was found (with an apparent turning point around 51.6). The above results generally correspond to the region, and they also need confirmation.
Xinye Chen (Fri,) studied this question.
Synapse has enriched 5 closely related papers on similar clinical questions. Consider them for comparative context: