Author(s): Hang Chen; Xiaode Zhou; Ying Wang; Wei Wu

Linked Author(s): Ying Wang, Xiaode Zhou

Keywords: Random forest model; Non-point source pollution; SWAT model; Riparian buffer zone; Width calculation

Abstract: In this study, SWAT model is used to simulate and calculate the non-point source pollution load in the riparian buffer zone, and empirical formula is used to estimate the pollutant concentration when surface runoff passes the edge of the riparian buffer zone, and the safety width of the riparian buffer zone is analyzed and calculated. The results are as follows. The simulated values of SWAT model were highly consistent with the measured values. The calibration and verification results of on hydrological station achieved Ens0.65, RE 15%, R2 0.85, total nitrogen load and total phosphorus load overall achieved Ens 0.65, RE 15%, R2 0.65. The TN and TP loads in the riparian buffer zone gradually increase from upstream to downstream. Among them, the concentration of TN load reaching the edge of the riparian buffer zone is the largest in the normal season, the minimum in the dry season, the concentration of TP load reaching the edge of the riparian buffer zone is the largest in the wet season, the minimum in the dry season. The width of the upstream riparian buffer zone in the reach shall be at least 77.9m, the width of the midstream riparian buffer zone in the reach shall be at least 33.37m, and the width of the downstream riparian buffer zone in the reach shall be at least 60.25m.

DOI: https://doi.org/10.3850/978-90-833476-1-5_iahr40wc-p0763-cd

Year: 2023