Al Leydecker began his work with Santa Barbara Channelkeeper in the fall of 2000, both as a volunteer and as the stream-team’s science advisor. He was actively engaged in research on the Ventura River and Goleta streams for over fifteen years. The reports, articles, and essays in this collection document his interests, thoughts, and conclusions. Almost all of them were written for his fellow volunteers, to help them understand what was happening and why long-term monitoring was so important. They are mostly written in a conversational style, unlike scientific papers, to further this aim. And, as he’s always believed that photos can often tell a better story than words, there are lots of pictures.
Al is now retired but until about 2016, he worked part-time in research and as an Environmental and Engineering consultant. He holds a Ph.D. in Biology from the University of California, Santa Barbara, a B.S. in Civil Engineering from the University of Tennessee, and is a licensed Professional Engineer.
After serving in the Army, Al returned to college to finish up his engineering degree. He’s had experience as a pig farmer, storekeeper and in various engineering positions with the U.S.D. A Forest Service; served as a County Supervisor in Mono County and worked as a Civil Engineer in numerous jobs and private practice. In 1992 he retuned to school to complete a doctorate at UCSB studying hydrology and biogeochemistry; most of his research dealt with acid rain and biogeochemical processes in snow-covered watershed in the Sierra Nevada.
Post-graduate work included more than seven years of research on nutrient export from the south coast’s streams and rivers as part of the Santa Barbara Channel Long Term Ecological Research Project (SBC-LTER). He is one of the co-authors of the 2008 UCSB study of the algal problem on the Ventura River.
Channelkeeper is deeply grateful for the many years of service and guidance that Al has provided to the program, including the valuable research and analysis documented in the articles below.
2002.11.15 Nutrient response of the Ventura River to drought.2002
2003.09.17 Biological uptake of nitrogen and phosphorus in coastal streams.2003
2003.11.21 Nutrient uptake and cycles of change.2003
2004.11.11 Nitrate storm flux in coastal catchments.2004
2005.11.28 Stormflow nutrients_a common urban response.2001
Looking at local streams.Feb.2017_for PDF
Looking at local streams.Jan.2018 (a)
Looking at local streams.Jan.2019_for PDF_std
Essays and reports on Algae & Nutrients
2003.10.31 Boom or Bust 2pp.
2004.04.05 While You Were Sleeping . . . 2pp.
2004.07.27 A Story About Conductivity, Climate and Change on the Ventura River 3pp.
2005.02 Cycles of Change on the Ventura River, 2001-2003, Part 1a 8pp.
2005.02 Cycles of Change on the Ventura River, 2001-2003, Part 1b 8pp.
2005.02 Cycles of Change on the Ventura River, Part 2, Before and After the Big Storm 8pp.
2005.02 Cycles of Change on the Ventura River, Part 3, Rainfall and the River 8pp.
2005.07.17 What’s All That Green Stuff in the Backcountry_Algae in 2005 12pp.
2005.08.16 Before Dawn’s Early Light 16pp.
2006.12 Changes from Dec. 2005 to Dec. 2006, A Photo Essay 5pp.
2008.04 What the . . . Algal Conundrums 1p
2008.04.13 Nutrients & Algal Growth 7pp.
2008.04.13 Ventura Diel Cycle_Apr. 9, 2008 6pp.
2008.05.22 Ventura River 24 hr Nutrient Cycle 2pp.
2008.05.30 Ventura Diel Cycle_May 15, 2008 16pp.
2008.06.10 The Ventura Lagoon Breaches on June 4 6pp.
2008.06.14 The Ventura Nutrient Story_June 2008 14pp.
2008.06.28 The Nutrient Story_June 2008_Addendum 3pp.
2008.07 Revisiting the 2003 Lower Ventura River 6pp.
2008.07.01 Ventura Diel Cycle_June 17, 2008 17pp.
2008.07.17 A July Look at Algae on the Ventura 12pp.
2008.07.17 A July Look at Algae on the Ventura 12pp.
2008.08.09 Ventura N-P Space 4pp.
2008.08.23 Ventura Diel Cycle_July 25, 2008 19pp.
2008.08.28 Attack of the Killer Effluent 4pp.
2008.09.28 We’re Back . . . 12pp.
2008.10.15 Diel Cycle_Sept 12_addendum 1p.
2008.10.22 Ventura Diel Cycle_September 12, 2008 22pp.
2008.12.12 A Christmas Surprise_The Ventura_Dec. 6, 2008 9pp.
2009.04.05 A little photo essay on the Ventura in April 3pp.
2009.04.12 Algae in 2009 – A Look at the Coming Season 18pp.
2009.05.16 Ventura Diel Cycle_April 17, 2009 20pp.
2009.06.06 Ventura Diel cycle_May 22, 2009 15pp.
2009.06.13 The Great Watercress Mystery of 2009 6pp.
2009.06.17 Predicting Chla from Delta-DO & Q 7pp.
2009.06.21 Rainfall & Runoff 17pp.
2009.06.21 Rainfall & Runoff 17pp.2
2009.07.23 Ventura Diel Cycle_June 26, 2009 14pp.
2009.08.03 Watercress Before and After_from S.Lewis 1p.
2009.09.04 Ventura Diel Cycle_August 7, 2009 15pp.
2009.09.05 The Chl-a vs. TN Relationship 10pp.
2009.09.08 Some Comments on the LWA Report_Sept. 2009 8pp.
2009.09.11 Looking at WWTP Contributions to Flux 2pp.
2009.10.11 Diel Cycle_September 25, 2009 16pp.
2009.11.12 Comments on the TetraTech Modeling Proposal 7pp.
2010.03.06 Watershed-Algae in the Ventura R. 20pp.
2010.03.19 Where Do the Nitrate Come From_Part I 14pp.
2010.03.31 Watershed U Handout_Leydecker
2010.05.07 N & P Land Use Comparison 1p.
2010.06.04 Where Do the Nitrate Come From_Summary 1p.
2010.06.07 Ventura Draft MS_Simpson&Leydecker 42pp.
2010.06.17 Where Do the Nitrate Come From_Part II 13pp.
2010.07.01 Ocean Acidification & the Flynn Effect 7pp.
2010.08.08 Ventura Diel Cycle_April-July, 2010 27pp.
2011.03.21 Final Report on Min DO, 2005-2010 5pp.
2012.02 Diel Oxygen Summary_2008 through 2011 12pp.
2012.03.15 Ventura Nutrient Concentrations 2008-2011 15pp.
2012.03.15 Ventura Nutrient Concentrations 2008-2011_The Short Version 1p.
2012.05 A Look at the Accuracy of SBCK DO Measurements 11pp.
2012.05 The Accuracy SBCK Diel DO Measurements – condensed version 1p.
Narratives on Nutrients for the UCSB Algal Report
2008.10.29 Graphs Explaining Nitrate 9pp.
2008.11.18 Looking at Phosphorus 8pp.
2009.03.09 Looking at Chl-a data 8pp.
2009.03.11 Stormflow & Concentration-Discharge 13pp.
2009.03.19 A look at SBCK monitoring sites VR09 & VR10
2009.03.20 Looking at Minimum DO and Chl-a 3pp.
2009.03.22 More Stuff on Nutrients 6pp.
2009.03.22 The implications of 2003 data on Chl-a vs TN relationship 5pp.
2009.03.30 Looking at Minimum DO and Chl-a, revised 10pp.
2009.03.30 Looking at Nitrate 6pp.
Other topics of Interest (2005-2013)
2005.02 A Curious Relationship Between E.coli and Enterococcus 8pp.
2005.02.16 Groundhog Day paper 24pp.
2007.11.09 Natural Enemies of Giant Reed (Arundo donax) 7pp.
2008.08.19 The E. coli-Fecal Coliform Question 10pp.
2008.08.21 fecal to E.coli ratio_addendum 10pp.
2012.04.30 April Rains 5pp.
2012.06.24 A Darth of Riparian Vegetation, sediment vs. water 3pp.
2013.04.23 Ventura April 7pp.
2013.06.28 The Conductivity-Rainfall-Nitrate Connection 7pp.
2013.07.12 Conductivity Stories 8pp.
2013.07.30 Graphic Tales 11pp.
2013.08.04 Some comments on riparian growth, Ventura River, Aug. 2013 3pp.
2013.10.25 The Isotope Story 10pp.
2013.11.07 Nitrate in the Ventura Watershed_print_min 26pp.
2014.01.07 Rainfall & the Ojai Watertable 6pp.
2014.10.05 the Santa Barbara groundwater table_2014 1p.
2014.10.08 Confluence Pool Water Levels 5pp.
2014.11.26 Some comments on the Hopkins Report 9pp.
2014.12.10 Thinking about Ventura Groundwater 10pp.
2014.12.31 Wet Winters During Times of Drought 13pp.