snow.h

降雪及积雪计算的源代码

/*
 * SUMMARY:      snow.h - header file for DHSVM snow routines
 * USAGE:        Part of DHSVM
 *
 * AUTHOR:       Bart Nijssen
 * ORG:          University of Washington, Department of Civil Engineering
 * E-MAIL:              [e-mail]
 * ORIG-DATE:    29-Aug-1996 at 16:03:11
 * LAST-MOD: Tue Jul 14 10:38:32 1998 by Keith Aric Cherkauer <[e-mail]>
 * $Id: snow.h,v 3.1.2.1 2004/05/06 00:37:56 tbohn Exp $
 * DESCRIPTION:  header file for DHSVM snow routines
 * DESCRIP-END.
 * FUNCTIONS:    
 * COMMENTS:     
 */

#ifndef SNOW_H
#define SNOW_H

#include <stdarg.h>

/* water holding capacity of snow as a fraction of snow-water-equivalent */ 
#define LIQUID_WATER_CAPACITY	0.035

/* multiplier to calculate the amount of available snow interception as
   a function of LAI (m) */
#define LAI_SNOW_MULTIPLIER	0.0005

/* the amount of snow on the canopy that can only be melted off. (m) */
#define MIN_INTERCEPTION_STORAGE	0.005

/* maximum depth of the surface layer in water equivalent (m)
   [default 0.125] */
#define MAX_SURFACE_SWE	0.125

/* density of new fallen snow [50] */
#define NEW_SNOW_DENSITY	50.
 
/* Minimum SWQ at which the snow pack is assumed to fully cover the grid cell (m) */
#define MAX_FULL_COVERAGE_SWQ   0.076

#endif