|
Trong l?nh v?c QLMT, cc nh nghin c?u khoa h?c th??ng ph?i ??i ??u v?i 1 kh?i l??ng l?n v? ch?t l??ng MT. Do ?, m?t t??ng m?i ???c hnh thnh l chuy?n t?i n?i dung ? thng qua 1 ch? s? ch?t l??ng mi tr??ng EQI (Environment Quality Index). Trong ?, WQI l 1 b? ph?n hnh thnh s?m v pht tri?n nhanh. WQI l 1 thng s? "t? h?p" ???c tnh ton t? nhi?u thng s? CLN theo 1 ph??ng php xc ??nh.
WQI ???c dng ?? m t? ??nh l??ng v? CLN v ???c bi?u di?n qua thang ?i?m t? 0 -100. WQI = 0 ?ng v?i CLN km nh?t v =100 ?ng v?i CLN t?t nh?t
Vi?c s? d?ng WQI c nhi?u ?u ?i?m:
- Cho php gi?m 1 l??ng l?n s? li?u t? m?t lo?t cc thng s? v?t l, ho h?c, vi sinh xu?ng cn 1 con s? ??n gi?n theo 1 ph??ng th?c ??n gi?n v c tnh l?p l?i
- L k?t qu? c?a vi?c tnh ton ton h?c nn cho php ?nh gi, phn lo?i khch quan CLN v cho php so snh CLN theo khng gian, th?i gian.
- Thch h?p v?i vi?c tin h?c ho nn thu?n l?i cho qu?n l v cung c?p thng tin cho c?ng ??ng.
Tuy nhin, n cng t?n t?i 1 s? h?n ch? sau:
- Thi?u s? nh?t tr v? cch ti?p c?n chung ?? thi?t k? ch? s? WQI
- WQI khng bao hm thng tin v? hi?u qu? kinh t? c ???c t? s? c?i thi?n CLN.
WQI c th? chia thnh nhi?u lo?i, song c ngh?a h?n c? l vi?c chia chng thnh 2 nhm:
- Cc ch? s? CLN chung cho m?i ngu?n n??c
- Cc ch? s? CLN theo m?c ?ch s? d?ng
?? c th? ?nh gi ch?t l??ng n??c theo WQI, cc b?n c th? lm tr?c ti?p trn m?ng. Cc b?n vo google, ?nh Water Quality Index Calculator, mn hnh s? hi?n ra cc b?ng tnh ton tr?c tuy?n. Th? lm xem sao. DVC |
