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--- start:hype_model_description:hype_sediment [2019/12/19 16:41]
cpers [Links to file reference]
+++ start:hype_model_description:hype_sediment [2020/06/15 16:55]
cpers [Diagnostic output variables - sediment load]
@@ Line 37: / Line 37: @@
 <m> mobilSed = 1000 * (MobilisedRain + MobilisedSR) * transportfactor </m>
-//Soil erosion model 2 (HBV-SED based model)//: The second model is based on HBV-SED model (Lidén, 1999; Lidén et al., 2001) and calculates particles mobilized by rain (//rain//). It also depends on soil and land characteristics in the form of model parameters and data on subbasin characteristics.
+//Soil erosion model 2 (HBV-SED based model)//: The second model is based on HBV-SED model (Lidén, 1999; Lidén et al., 2001) and calculates particles mobilized by rain (//rain//). When the ground is frozen or there is snow on the ground, the no particles are mobilized. The mobilization also depends on soil and land characteristics in the form of model parameters and data on subbasin characteristics.
 <m> mobilSed = 1000. * ({slope / 5})^{erodslope} * erodluse * erodsoil * {EI/erodindex} * rain^{erodexp} </m>
@@ Line 146: / Line 146: @@
 |:::|sedimentation_resuspension|:::|
+===== Diagnostic output variables - sediment load =====
+The load of sediment leaving a subbasin is calculated for suspended sediments (''cSSl'') and total sediments (''cTSl'').
+Net load of main river and outlet lake can be calculated for suspended sediments (SS) and total sediments (TS). The output variables ID are ''nlSS'' and ''nlTS''. Net load of main river and outlet lake is calculated from the inflow and outflow of substance to the main river and outlet lake in a subbasin as one system. The inflow is composed of upstream coming inflow and local inflow to the main river. The outflow is the outflow of the subbasin through the main and secondary branch. The net load is the load of outflow minus the load of inflow.
+Included in the net load is the effect of production of algae in the lake (for TS), point sources. Reduction of the net load is the effect of sedimentation, but also abstraction of water for irrigation or other purposes. In the case of zero outflow, or if the incoming load is larger than the load leaving the system, the net load becomes negative. Negative load could thus be caused by e.g. sedimentation, but also temporary holding up the sediment in the system. For subbasins holding a part of a lake, i.e. a lake basins, it is also possible that the water flow between the lake basins is (temporary) opposite of what is defined as downstream in GeoData. In this case the outflow of the subbasin is zero, and the net load of main river and outlet lake become negative.

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