# Coarse woody debris, amount and distribution of in Lookout Creek, Andrews Experimental Forest 1991 ## Dataset - **Database Code:** GS016 - **Title:** Coarse woody debris, amount and distribution of in Lookout Creek, Andrews Experimental Forest 1991 - **Abstract:** These data describe the amount and distribution of coarse woody debris on the valley floor of the mainstem of Lookout Creek and characterizing it in relation to river morphology. Data include the number, volume, location, orientation, decay class, and pool formation roles of large wood debris pieces. River morphology is characterized by cross-section data (sampled every 100 m) and in sketch map in the Nakamura and Swanson (1994) publication. This was a one-time sample in 1991 employing simple tape and compass field techniques (Nakamura and Swanson 1994). Data tables cover 1. wood piece measurements (diameter, length, location, decay class) and 2. channel geometry measurements. - **Keywords:** geomorphology; disturbance; woody debris; coarse woody debris; organic matter; aquatic ecosystems; streams; disturbance; organic matter - **Temporal coverage:** 1991-01-07 to 1991-01-09 - **Principal Investigator:** Frederick J. Swanson ## Data Entities 1. GS01601 2. GS01602 ## Entity 1: GS01601 ### Attribute list - **STCODE** — varchar, freetext Study code - **FORMAT** — numeric(1), range 1.0000 1.0000, number Format - **LOGNUM** — numeric(1), range 1.0000 1692.0000, number Log number - **SITENUM** — numeric(1), range 1.0000 1107.0000, number Site number - **ANGLE** — varchar, enum Angle of log to channel (acute angle) - **1** — 0 - 45 degrees - **** — No angle measurement taken - **4** — 135 - 180 degrees - **2** — 45 - 90 degrees - **3** — 90 - 135 degrees - **SECTNUM** — numeric(1), range 1.0000 85.0000, number Number of 50 meter channel section - **SUSPEND** — varchar, enum Is log totally suspended - **1** — Yes - **** — No - **MAINSTRM** — varchar, enum Is log in main channel - **1** — Yes - **** — No - **SIDESTRM** — varchar, enum Is log in side channel - **1** — Yes - **** — No - **ABNDSTRM** — varchar, enum Is log in abandoned channel - **1** — Yes - **** — No - **SANDBAR** — varchar, enum Is log in a sandbar or floodplain - **1** — Yes - **** — No - **SIDESLOP** — varchar, enum Is log on side slope - **1** — Yes - **** — No - **TERRACE** — varchar, enum Is log on terrace - **1** — Yes - **** — No - **BOULDER** — varchar, enum Is log touching a boulder > 1 meter in diameter - **1** — Yes - **** — No - **LOG** — varchar, enum Is log touching another log - **1** — Yes - **** — No - **POOL** — varchar, enum Did log contribute to pool formation (see nakamura paper for criteria) - **1** — Yes - **** — No - **DIAM1** — numeric(1.000000), range 2.0000 175.0000, centimeters Diameter of log at one end - **DIAM2** — numeric(1.000000), range 3.0000 170.0000, centimeters Diameter of log at other end (if diam1 = diam2, log was measured in the midd le only) - **LENGTH** — numeric(0.100000), range 0.8000 50.0000, meters Length of log - **TOTLOGVOL** — numeric(0.010000), range 0.0100 56.5700, cubic meters Volume of log computed as (pi * (diam1+diam2)*length/8) * multfctr - **DECOMP** — varchar, enum Decomposition code - **2** — Bark partially attatched, log hard - **5** — Extremely decayed log - **1** — Bark tight, log hard - **3** — No bark, log hard - **4** — No bark, log soft - **MULTFCTR** — numeric(0.010000), range 0.1000 1.0000, number Multiplication factor to correct volume measurement to reflect the true volu me of the log in the channel area ## Entity 2: GS01602 ### Attribute list - **STCODE** — varchar, freetext Study code - **FORMAT** — numeric(1), range 2.0000 2.0000, number Format - **SECTNUM** — numeric(1), range 1.0000 85.0000, number Number of 50 meter channel section - **NUMLOGS** — numeric(1.000000), range 0.0000 126.0000, number Number of logs in the section - **VOLUME** — numeric(0.010000), range 0.0000 249.4100, cubic meters Volume of all logs in the section - **AREA1** — numeric(0.010000), range 4.6700 35.4500, square centimeters Map area of the section (including channels, floodplains, and bars) - **WIDTH** — numeric(0.010000), range 9.3400 70.9000, meters Average section width - **THWGLEN** — numeric(0.010000), range 4.8300 7.5300, centimeters Map length of thalweg - **SUMTHWG** — numeric(0.010000), range 10.1200 19.3300, centimeters Sum of map length of thalweg in the preceding, current, and following sections. - **DIRTHWG** — numeric(0.010000), range 8.9900 17.3600, centimeters Direct map length from upstream end of preceding section thalweg to downstream end of following section thalweg. - **LSINUOUS** — numeric(0.010000), range 0.9900 1.7100, number Sinuousity - sumthwg / dirthwg - **GEOMTYPE** — varchar, enum Geomorphic type code - **4** — Ave section width < 19.0 meters, sinuousity < 1.09 (type nst in paper) - **2** — Section width > 19.0 meters, sinuousity < 19.0 meters (type wst in paper) - **3** — Ave section width < 19.0 meters, sinuousity > 1.09 (type nsi in paper) - **1** — Section width > 19.0 meters, sinuousity > 1.09 (type wsi in paper) - **NUMCHANS** — varchar, enum Number of channels code - **S** — Single channel in section - **M** — Multiple channels in section - **BOULDERS** — varchar, enum Presence of boulders >= 1 meter in diameter - **B** — Boulders >= 1 meter in diam exist in the section ## Attribute Definitions **ABNDSTRM** Is log in abandoned channel **ANGLE** Angle of log to channel (acute angle) **AREA1** Map area of the section (including channels, floodplains, and bars) **BOULDER** Is log touching a boulder > 1 meter in diameter **BOULDERS** Presence of boulders >= 1 meter in diameter **DECOMP** Decomposition code **DIAM1** Diameter of log at one end **DIAM2** Diameter of log at other end (if diam1 = diam2, log was measured in the midd le only) **DIRTHWG** Direct map length from upstream end of preceding section thalweg to downstream end of following section thalweg. **FORMAT** Format **GEOMTYPE** Geomorphic type code **LENGTH** Length of log **LOG** Is log touching another log **LOGNUM** Log number **LSINUOUS** Sinuousity - sumthwg / dirthwg **MAINSTRM** Is log in main channel **MULTFCTR** Multiplication factor to correct volume measurement to reflect the true volu me of the log in the channel area **NUMCHANS** Number of channels code **NUMLOGS** Number of logs in the section **POOL** Did log contribute to pool formation (see nakamura paper for criteria) **SANDBAR** Is log in a sandbar or floodplain **SECTNUM** Number of 50 meter channel section **SIDESLOP** Is log on side slope **SIDESTRM** Is log in side channel **SITENUM** Site number **STCODE** Study code **SUMTHWG** Sum of map length of thalweg in the preceding, current, and following sections. **SUSPEND** Is log totally suspended **TERRACE** Is log on terrace **THWGLEN** Map length of thalweg **TOTLOGVOL** Volume of log computed as (pi * (diam1+diam2)*length/8) * multfctr **VOLUME** Volume of all logs in the section **WIDTH** Average section width ## Enumerated Domains ### ANGLE - **1** — 0 - 45 degrees - **** — No angle measurement taken - **4** — 135 - 180 degrees - **2** — 45 - 90 degrees - **3** — 90 - 135 degrees ### SUSPEND - **1** — Yes - **** — No ### MAINSTRM - **1** — Yes - **** — No ### SIDESTRM - **1** — Yes - **** — No ### ABNDSTRM - **1** — Yes - **** — No ### SANDBAR - **1** — Yes - **** — No ### SIDESLOP - **1** — Yes - **** — No ### TERRACE - **1** — Yes - **** — No ### BOULDER - **1** — Yes - **** — No ### LOG - **1** — Yes - **** — No ### POOL - **1** — Yes - **** — No ### DECOMP - **2** — Bark partially attatched, log hard - **5** — Extremely decayed log - **1** — Bark tight, log hard - **3** — No bark, log hard - **4** — No bark, log soft ### GEOMTYPE - **4** — Ave section width < 19.0 meters, sinuousity < 1.09 (type nst in paper) - **2** — Section width > 19.0 meters, sinuousity < 19.0 meters (type wst in paper) - **3** — Ave section width < 19.0 meters, sinuousity > 1.09 (type nsi in paper) - **1** — Section width > 19.0 meters, sinuousity > 1.09 (type wsi in paper) ### NUMCHANS - **S** — Single channel in section - **M** — Multiple channels in section ### BOULDERS - **B** — Boulders >= 1 meter in diam exist in the section