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Table 2

Indicators and their frequency usage in river health assessment

Layer 1 (OL)Layer 2 (RL)Layer 3 (IL) Indicator and its frequency
River health comprehensive index Hydrology Flow process variation degree (37), sediment transport change (19), flow velocity and state (17), water level change (13), cutoff ratio (7). 
Water quality Achievement ratio of ecological water demand (45), achievement ratio of water quality in water functional area (40), comprehensive pollution index of water quality (37), DO (29), salinity (22), water temperature (21), total phosphorus (16), status of sediment pollutants (15), BOD5 (14), pH (14), ammonia nitrogen (11), integrated pollution index of heavy metals (10), permanganate index (10). 
Aquatic organism Fish species (33), benthic index (28), zooplankton (25), phytoplankton (23), survival status of rare animals (20), basin biodiversity index (15), aquatic plant (11), alien species (7). 
Physical habitats Riverbank vegetation coverage ratio (47), stability of river bed (43), stability of riverbank (38), longitudinal connectivity (38), wetland conservation ratio (22), natural vegetation coverage (25), meandering degree (23), habitat quantity and quality (20), soil erosion (15), river stability (14), slope (12), river shading rate (12), habitat condition (11). 
Layer 1 (OL)Layer 2 (RL)Layer 3 (IL) Indicator and its frequency
River health comprehensive index Hydrology Flow process variation degree (37), sediment transport change (19), flow velocity and state (17), water level change (13), cutoff ratio (7). 
Water quality Achievement ratio of ecological water demand (45), achievement ratio of water quality in water functional area (40), comprehensive pollution index of water quality (37), DO (29), salinity (22), water temperature (21), total phosphorus (16), status of sediment pollutants (15), BOD5 (14), pH (14), ammonia nitrogen (11), integrated pollution index of heavy metals (10), permanganate index (10). 
Aquatic organism Fish species (33), benthic index (28), zooplankton (25), phytoplankton (23), survival status of rare animals (20), basin biodiversity index (15), aquatic plant (11), alien species (7). 
Physical habitats Riverbank vegetation coverage ratio (47), stability of river bed (43), stability of riverbank (38), longitudinal connectivity (38), wetland conservation ratio (22), natural vegetation coverage (25), meandering degree (23), habitat quantity and quality (20), soil erosion (15), river stability (14), slope (12), river shading rate (12), habitat condition (11). 
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