Archive for February, 2013

Associate Editor, Water Quality Monitoring

Friday, February 22nd, 2013

JAWRA would like to add a second Associate Editor for Water Quality Monitoring. This particular position would focus on evaluating chemical and biological sampling efforts. JAWRA often receives manuscripts reporting the results of sampling, and it’s important to identify those with truly important and interesting results.

JAWRA Associate Editors (AEs) serve as primary advisors to the JAWRA Editor. Responsibilities fall into two areas: reviews and subject development. The AE for Water Quality Monitoring handles about 20 papers per year, which would be divided between the two incumbents. All manuscripts are processed through our ScholarOne Manuscripts™system, with the AE selecting reviewers and, when reviews return, making a recommendation to the Editor. AE’s are encouraged to seek out qualified authors in their subject areas and encourage them to submit papers to JAWRA. These could be individual submittals or as featured collections of related papers organized around an introduction.

Associate editorship is a volunteer position earning our heartfelt thanks and an invitation to our annual AE luncheon. It also offers the opportunity to make a difference on the cutting edge of multidisciplinary water resources. Many AE’s have found the experience of making decisions on manuscripts helpful in sharpening their own professional writing skills. The term of an AE is three years, but may be extended by mutual agreement.

Interested individuals should email their CV to the Editor at editor@awra.org. We are happy to answer any questions. We will hold this position open at a minimum until March 20, but early application is encouraged.

Declining a review invitation

Tuesday, February 19th, 2013

One of our Associate Editors just sent a reviewer a nice note thanking him for promptly declining an invitation to review a manuscript. I second this thanks!

While we certainly would have preferred him to accept the invitation, he did the next best thing. We appreciate his directness, which lets us move right along to another selection. Contrast this with the scoundrel who accepts then falls of the face of the earth, leaving us stuck.

Predicting a Braided River Planform

Wednesday, February 13th, 2013

Early View Article:Predicting the Planform Configuration of the Braided Toklat River, Alaska, With a Suite of Rule-Based Models,” by  Charles J.P. Podolak.

Braid Plain Characteristics

This article presents an application of a suite of rule-based reduced-complexity models to provide understanding of the future likely condition of a particular section of the dynamic Toklat River, in Denali National Park and Preserve, Alaska, sufficient to inform management decisions. This approach combined an analysis of large-scale influences on stability with several reduced-complexity models to produce the predictions at a practical level for managers concerned about the persistence of bank erosion while acknowledging the great uncertainty in any landscape prediction. First, a model of confluence angles reproduced observed angles of a major confluence, but showed limited susceptibility to a major rearrangement of the channel planform downstream. Second, a probabilistic map of channel locations was created with a two-parameter channel avulsion model. The predicted channel belt location was concentrated in the same area as the current channel belt. Finally, a suite of valley-scale channel and braid plain characteristics were extracted from a light detection and ranging (LiDAR)-derived surface. The characteristics demonstrated large-scale stabilizing topographic influences on channel planform. The combination of independent analyses increased confidence in the conclusion that the Toklat River braided planform is a dynamically stable system due to large and persistent valley-scale influences, and that a range of avulsive perturbations are likely to result in a relatively unchanged planform configuration in the short term.

[Please note: I have quoted and paraphrased freely from the article, but the interpretation is my own.]

Lidar and Hydrography Change Detection

Wednesday, February 6th, 2013

Early View Article:Hydrography Change Detection: The Usefulness of Surface Channels Derived From LiDAR DEMs for Updating Mapped Hydrography,” by Sandra K. Poppenga, Dean B. Gesch, and Bruce B. Worstell.

It’s hard to understand terrain if you don’t know where the water is flowing. In this article, the authors describe the usefulness of surface channels derived from LiDAR DEMs for hydrography change detection to derive spatially accurate and time-relevant mapped hydrography. The methods employ analyses of horizontal and vertical differences between LiDAR-derived surface channels and National Hydrography Dataset (NHD) flow lines to define candidate locations of hydrography change. These methods alleviate the need to analyze and update the nationwide NHD for time relevant hydrography, and provide an avenue for updating the dataset where change has occurred.

The authors illustrate methods for improving NHD mapped hydrography that employ change detection analysis of LiDAR-derived surface channels and NHD hydrography flow lines to identify anomalies that exceed 12.2 m, a National Map Accuracy Standard (NMAS) guideline for 1:24,000-scale maps. Anomalies that exceed that informational metric are spatially validated by sampling and quantifying elevation values of both the LiDAR-derived surface channel and mapped hydrography flow lines. In other words, LiDAR surface channels that deviate in excess of 12.2 m horizontally from mapped hydrography flow lines are locations of potential surface channel changes. These locations are validated by measuring the vertical elevation differences between the LiDAR surface channels and mapped hydrography flow lines. These methods are beneficial for updating NHD because only the locations suspected of hydrography change will need to be reviewed for spatial accuracy and currency, rather than an entire hydrography dataset.

[Please note: I have quoted and paraphrased freely from the article, but the interpretation is my own.]