漓江上游水污染评价及水量水质耦合模拟OA

Taking the Lijiang River as the study subject,the single-factor index evaluation method and the compre-hensive pollution index evaluation method were employed to evaluate the water quality at key sections of the Lijiang River from 2010 to 2019.A one-dimensional hydrodynamic water quality model was also constructed to reveal the coupled water quantity-quality variations in the mainstream of the Lijiang River.The results show that during the study period,the overall water environment of the Lijiang mainstream was satisfactory,with all water quality indica-tors at each section meeting the Class III standard or better,and the comprehensive pollution index ranging from 0.479 to 0.659.The one-dimensional hydrodynamic water quality model demonstrated good fitting performance.The annual average fluxes of permanganate index(CODMn),ammonia nitrogen(NH3-N),and total phosphorus(TP)at the Guilin Hydrological Station were 7,681.80 t,651.45 t,and 248.77 t,respectively.Due to the influence of agricul-tural non-point source pollution during the flood season,the fluxes of CODMn and TP at the Yangshuo Hydrological Station were 1.65 and 2.28 times those at Guilin Hydrological Station,respectively.The findings of this study pro-vide a scientific basis for water pollution control in the Lijiang River.